Category: A-level physics light
What is accommodation?
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?
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?
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.
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
A ray of monochromatic light is incident at a small angle of incidence on a small angle prism in air. Obtain the expression d= A(n-1), for deviation, d, of light by the prism where A is the refracting angle of the prism and n is the refractive index.
A ray of monochromatic light is incident at a small angle of incidence on a small angle prism in air. Obtain the expression d= A(n-1), ... Read More
Describe how the refractive index of a prism can be determined using optical pins
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
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?
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.
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
Show that m + 1 = u/f for a convex lens where symbols carry their usual meaning
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Describe, giving the relevant equations, how the refractive index of a liquid can be determined using a convex lens of known radius of curvature
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.
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.
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.
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.
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.
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?
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
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
With the aid of a labelled diagram, describe the essential parts of photographic camera.
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An object is placed a distance f + x from a converging lens of focal length, f. the lens produces an image at a distance f+ y from the lens. Show that f2 = xy
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Derive the expression for the magnifying power of a magnifying glass when the final image is formed at the near point
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.
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
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.
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.
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.
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
A point object is placed at a distance, u, in front of a diverging lens of focal length, f, to form an image a distance, v, from the lens. Derive an expression that related u, v and f.
A point object is placed at a distance, u, in front of a diverging lens of focal length, f, to form an image a distance, ... Read More
Give the properties of a lens in achromatic combination
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
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.
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
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
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
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
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.
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
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
Describe an experiment to show that light travels in straight line
Describe an experiment to show that light travels in straight line Equal square cards A,B and D are cut from piece of thick paper board ... Read More
Draw ray diagrams to show the formation of shadows when part an extended source is used.
Draw ray diagrams to show the formation of shadows when part an extended source is used. With extended light a dark inner shadow , umbra ... Read More
Draw ray diagrams to show the formation of shadows when part a point source is used
Draw ray diagrams to show the formation of shadows when part a point source is used Not that with point source of light he shadow is ... Read More
What is meant by rectilinear propagation of light?
What is meant by rectilinear propagation of light? Light travels in straight line Please subscribe to promote our website, subscription is free Thank you so ... Read More
State the effect on the image on a pin-hole camera of decreasing the distance between the pin-hole and the film.
State the effect on the image on a pin-hole camera of decreasing the distance between the pin-hole and the film. İmage become diminished and ... Read More
State the effect on the image on a pin-hole camera of enlarging a pinhole
State the effect on the image on a pin-hole camera of enlarging a pinhole Image become bright but blurred Please subscribe to promote our website, ... Read More
Draw a labeled ray diagram to show the formation of an image in a pin-hole camera.
Draw a labeled ray diagram to show the formation of an image in a pin-hole camera. or Please subscribe to promote our website; subscription is ... Read More
Sketch a diagram to show the formation of a solar eclipse.
Sketch a diagram to show the formation of a solar eclipse. Please subscribe to promote our website, subscription is free Thank you so much Read More
What are opaque objects?
What are opaque objects? Opaque medium is one which does not allow light to pass through it at e.g. brick wall, person Please subscribe to ... Read More
What is translucent medium?
What is translucent medium? Translucent medium is one which allows some light to pass through it but objects are not clearly seen through it. E.g. ... Read More
What is a transparent medium?
What is a transparent medium? Transparent Medium is a substance that allows almost all the light to pass through it and objects are clearly seen ... Read More
Name examples of artificial source of light?
Name examples of artificial source of light? Artificial luminous bodies include bulb, candle, kerosene lamp etc. Please subscribe, subscription is free Thank you Read More
Give examples of sources of light?
Give examples of sources of light? Natural sources include sun, star, glowing insects Please subscribe Thank you Read More
State applications of echoes
State applications of echoes Measurement of velocity of sound in air In medicine field to give an image of internal structure of the body In ... Read More
What is the effect of decreasing the speed of waves in the ripple tank on frequency?
What is the effect of decreasing the speed of waves in the ripple tank on frequency? No change in frequency since frequency depends on the ... Read More
How can the speed of waves in ripple tank be reduced
How can the speed of waves in ripple tank be reduced? By placing (or dipping) thin glass in the tank making water shallower. thank you Read More
Explain why an approaching train can easily be detected by human ears placed close to the rail.
Explain why an approaching train can easily be detected by human ears placed close to the rail. Because sound travels faster in solids than in ... Read More
Explain why a dog is more able than human beings to detect the presence of a thief tiptoeing at night
Explain why a dog is more able than human beings to detect the presence of a thief tiptoeing at night A tip toeing thief produced low ... Read More
(b) Describe an experiment to show that sound waves require a material medium for transmission.
Describe an experiment to show that sound waves require a material medium for transmission. Electric bell hung from rubber bands inside a bell jar is ... Read More
What is meant by sound?
What is meant by sound? Sound is a form of energy that travels in form of longitudinal waves from one point thank you Read More
What is an echo?
What is an echo? Echo is reflected sound Read More
Main Properties of electromagnetic waves
Main Properties of electromagnetic waves (i).Electromagnetic waves travel with a speed of3 x 108 m s-1 in vacuum. (ii).Electromagnetic waves are transverse. (iii).Electromagnetic waves can ... Read More
LOUDNESS OF SOUND depends on
Factors that affect loudness of sound The varying pressure exerted on the eardrum by the sound, The sensitivity of the ear to the different frequencies, ... Read More
APPLICATIONS OF ULTRASONICS
APPLICATIONS OF ULTRASONICS Ultrasonic enable bats to judge the distance of an object from the time taken by the reflected wave to return. Ultrasonic are ... Read More