Category: Physics questions and answers

Geometrical optic (light) revision questions and answers

07/17/2021 0

Geometrical optic revision questions and answers 1. (a) (i) derive the relationship, for convex lens, where u is the object distance, v is the image ... Read More

Waves A-level revision questions with answers

07/13/2021 0

(a) What is meant by interference pattern as applied to waves. (03marks) When two sound waves meet they superpose. The interference pattern produced depends on ... Read More

Magnetism (A-level revision questions with answers)

07/11/2021 0

1. (a)(i) Write down an expression for the force on a charge, q coulombs moving with velocity, u, at an angle, α, to a uniform ... Read More

Explain why a current carrying conductor placed in a magnetic field experiences a force

06/26/2021 0

Explain why a current carrying conductor placed in a magnetic field experiences a force The current sets up magnetic field around the wire. When the ... Read More

How can a d.c. generator be converted into an a.c. generator.

05/29/2021 0

How can a d.c. generator be converted into an a.c. generator. To convert a d.c. generator to an a.c. generator, the ends of the rectangular ... Read More

Explain the variation of successive ionization energy of an atom

05/22/2021 0

The variation of successive ionization energy of an atom Successive ionization energy increases due to increase increases in effective nuclear charge on the remaining electrons ... Read More

With the aid of a diagram describe the structure and action of reflecting telescope

04/11/2021 0

With the aid of a diagram describe the structure and action of reflecting telescope. Please subscribe to promote our website. Subscription is free. Thank you ... Read More

Explain why chromatic aberration is not observed in simple microscope.

04/11/2021 0

Explain why chromatic aberration is not observed in simple microscope. Please subscribe to promote our website. Subscription is free. Thank you so much Read More

Draw the action of astronomical telescope in normal adjustment and derive an expression for magnification.

04/11/2021 0

Draw the action of astronomical telescope in normal adjustment and derive an expression for magnification. Note, when an astronomical telescope is in normal adjustment, the ... Read More

What are the advantages and disadvantages of Galilean telescope?

04/11/2021 0

What are the advantages of Galilean telescope? Advantages Forms an erect image with only two lenses. It short and potable because the distance between the ... Read More

Draw a ray diagram to show the formation of a final image in Galilean telescope in normal adjustment.

04/11/2021 0

Draw a ray diagram to show the formation of a final image in Galilean telescope in normal adjustment. Please subscribe to promote our website. Subscription ... Read More

Describe with aid of a labelled diagram the structure and operation of a projection lantern.

04/11/2021 0

Describe with aid of a labelled diagram the structure and operation of a projection lantern. Please subscribe to promote our website . Subscription is free. ... Read More

State advantages of reflecting telescope over refracting telescope.

04/11/2021 0

State advantages of reflecting telescope over refracting telescope. There is no chromatic aberration There is no spherical aberration High resolution The image is brighter It ... Read More

What is the significance of the eye-ring of an astronomical telescope?

04/11/2021 0

What is the significance of the eye-ring of an astronomical telescope? It is the best position for placing the eye, to view the image through ... Read More

Define the Eye-ring as applied to a telescope?

04/11/2021 0

Define the Eye-ring as applied to a telescope. This is the image of objective formed by the eyepiece and is the best position to place ... Read More

Describe with aid of a diagram, a compound microscope forms image at near point

04/11/2021 0

Describe with aid of a diagram, a compound microscope forms image at near point. Please subscribe to promote our website. Subscription is free. Thank you ... Read More

State differences between a compound microscope and an astronomic telescope.

04/11/2021 0

State differences between a compound microscope and an astronomic telescope. Compound microscope Astronomical telescope -          View near objects -          Objective lens has smaller      ... Read More

Why should the objective and eye piece for compound microscope have short focal length?

04/11/2021 0

Why should the objective and eye piece for compound microscope have short focal length? Please subscribe to promote our website. Subscription is free. Thank you ... Read More

Draw a diagram to show the formation of an image by a compound microscope in in normal adjustment and use it to derive an expression for magnifying power

04/11/2021 0

Draw a diagram to show the formation of  an image by a compound microscope in in normal adjustment and use it to derive an expression ... Read More

Derive an expression for magnifying power of magnifying glass when the final image is formed at near point.

04/11/2021 0

Derive an expression for magnifying power of magnifying glass when the final image is formed at near point. Please subscribe to promote our website. Subscription ... Read More

State disadvantages of terrestrial telescope.

04/11/2021 0

State disadvantages of terrestrial telescope. It long and bulky due extra image inverting lens Extra diffraction occurs in erecting lens reducing the clarity of the ... Read More

What is angular magnification (magnifying power, M)?

04/11/2021 0

What is angular magnification (magnifying power, M)? This is the ratio of the angle subtended at the eye by the image when using an instrument ... Read More

What is a visual angle (α)?

04/11/2021 0

What is a visual angle (α)? This is the angle subtended by the object at the unaided eye.   Please subscribe to promote our website. ... Read More

What is accommodation?

04/11/2021 0

What is accommodation? This is the ability of the eye to clearly see near and far object.   Please subscribe to promote our website. Subscription ... Read More

What is a far point as applied to optical instrument?

04/11/2021 0

What is a far point as applied to optical instrument? This is the furthest point which can be seen distinctly by the unaided eye. For ... Read More

What is a near point?

04/11/2021 0

What is a near point? This is the nearest position that can be focused distinctly by the unaided eye. The distance from the eye to ... Read More

Define limiting angle of a prism.

04/10/2021 0

Define limiting angle of a prism. This is the maximum angle of the prism for which light incident on the prism at 900 emerges from ... Read More

Describe how the refractive index of a prism can be determined using optical pins

04/10/2021 0

Describe how the refractive index of a prism can be determined using optical pins Please subscribe to promote our website. Subscription is free. Thank you ... Read More

Find an angle of incidence i, on equilateral prism of refractive index 1.5 placed in air, when light passes through which symmetrically

04/10/2021 0

Find an angle of incidence i, on equilateral prism of refractive index 1.5 placed in air, when light passes through which symmetrically. Please subscribe to ... Read More

When does light pass through the prism symmetrically?

04/10/2021 0

When does light pass through the prism symmetrically? Light passes through the prism when the angle of incidence is equal to the angle of emergence. ... Read More

Derive an expression for refractive index of a prism in terms of the refractive angle, A and the minimum deviation, D.

04/10/2021 0

Derive an expression for refractive index of a prism in terms of the refractive angle, A and the minimum deviation, D. Please subscribe to promote ... Read More

Describe, giving the relevant equations, how the refractive index of a liquid can be determined using a convex lens of known radius of curvature

04/10/2021 0

Describe, giving the relevant equations, how the refractive index of a liquid can be determined using a convex lens of known radius of curvature.   ... Read More

Describe an experiment to determine the focal length of concave lens using a convex mirror of known focal length.

04/10/2021 0

Describe an experiment to determine the focal length of concave lens using a convex mirror of known focal length. Please Subscribe to promote our website. ... Read More

Describe how the focal length of a diverging lens may be determined.

04/10/2021 0

Describe how the focal length of a diverging lens may be determined. Please subscribe to promote our website. Subscription is free Thank you so much Read More

(d) Explain why lenses of narrow apertures are preferred to lenses of wide apertures in optical instrument.

04/10/2021 0

  Explain why lenses of narrow apertures are preferred to lenses of wide apertures in optical instrument. Lenses of narrow apertures show low spherical aberration. ... Read More

Derive the relation between the focal length, f, object distance, u, and image distance, v, for a thin lens.

04/10/2021 0

Derive the relation between the focal length, f, object distance, u, and image distance, v, for a thin lens. Please subscribe to promote our website. ... Read More

With the aid of a diagram, explain why the image seen in a magnifying glass is almost free from chromatic aberration when the eye is close to the lens.

04/10/2021 0

With the aid of a diagram, explain why the image seen in a magnifying glass is almost free from chromatic aberration when the eye is ... Read More

How the aberrations in  minimized in a reflecting telescope?

04/10/2021 0

How the aberrations in  minimized in a reflecting telescope? By grinding a lens so that it protrudes more near the center and making some adjustments ... Read More

Explain how chromatic and spherical aberration are minimized in a photographic camera

04/10/2021 0

Explain how chromatic and spherical aberration are minimized in a photographic camera By grinding a lens so that it protrudes more near the center and ... Read More

Derive the expression for the magnifying power of a magnifying glass when the final image is formed at the near point

04/10/2021 0

Derive the expression for the magnifying power of a magnifying glass when the final image is formed at the near point. Solution Please subscribe to ... Read More

Derive the expression for the focal length of a combination of two thin converging lenses in contact, in terms of their focal lengths.

04/10/2021 0

Derive the expression for the focal length of a combination of two thin converging lenses in contact, in terms of their focal lengths. or Show ... Read More

Explain how spherical aberration is minimized in photographic camera

04/10/2021 0

Explain how spherical aberration is minimized in photographic camera By grinding a lens so that it protrudes more near the center and making some adjustments ... Read More

Draw a ray diagram to show formation of an image of an infinite object by a concave lens. And describe the image formed.

04/10/2021 0

Draw a ray diagram to show formation of an image of an infinite object by a concave lens. And describe the image formed it is ... Read More

Briefly explain why an observer sees a spectrum of colors through rain drops when it is raining on a sunny day.

04/10/2021 0

Briefly explain why an observer sees a spectrum of colors through rain drops when it is raining on a sunny day. White light undergoes dispersion ... Read More

Derive an experiment to determine the focal length of concave lens using a plane mirror, a converging lens and an illuminated object.

04/10/2021 0

Derive an experiment to determine the focal length of concave lens using a plane mirror, a converging lens and an illuminated object.  A plane mirror ... Read More

Give the properties of a lens in achromatic combination

04/10/2021 0

Give the properties of a lens in achromatic combination Achromatic lenses are corrected to bring two wavelengths (typically red and blue) into focus on the same ... Read More

With the aid of ray diagrams, explain the term conjugate point as applied to lenses

04/10/2021 0

With the aid of ray diagrams, explain the term conjugate point as applied to lenses These are two points; O and I, on the opposite ... Read More

With the aid of a sketch ray diagram explain spherical aberration in concave lenses and state how it is minimized.

04/10/2021 0

With the aid of a sketch ray diagram explain spherical aberration in concave lenses and state how it is minimized. Spherical aberration in concave lens ... Read More

Draw a sketch ray diagram showing formation of the image of a finite size real object by a concave lens

04/10/2021 0

Draw a sketch ray diagram showing formation of the image of a finite size real object by a concave lens Please subscribe to promote our ... Read More

Describe an experiment to determine the focal length of thin converging lens mounted inside a short cylindrical tube

04/10/2021 0

Describe an experiment to determine the focal length of thin converging lens mounted inside a short cylindrical tube The tube is placed between an illuminated ... Read More

Define the power of a lens

04/10/2021 0

Define the power of a lens The power of a lens is a reciprocal of focal length of a lens in meters Units: diopter Please ... Read More

Define center of curvature of converging lens

04/10/2021 0

Define center of curvature of converging lens. Centre of curvature of a lens: This is center of the spheres of which the lens surfaces form ... Read More

Explain with the aid of a diagram, why a parabolic mirror is preferred to concave mirror as a car head lamp.

04/10/2021 0

Explain with the aid of a diagram, why a parabolic mirror is preferred to concave mirror as a car head lamp. Parabolic mirrors form strong ... Read More

Give differences between a pinhole camera and a lens camera

04/10/2021 0

Give differences between a pinhole camera and a lens camera In a pinhole camera the image is always focused while in a lens camera the ... Read More