NEET
Practice Test 13
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Chromatic aberration in a lens is caused by

A red flower kept in green light will appear

Resolving power of a telescope increases with

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Rectilinear motion of light in a medium is caused due to

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    If the medium is heterogeneous having a gradient of refractive index. Then light rays will not follow a rectilinear(straight line path).

In optical fibres, propagation of light is due to

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    Optical fibre is a device which transmits light introduced at one end to the opposite end, with little loss of the light through the sides of the fibre. It is possible with the help of total internal reflection.

Amount of light entering into the camera depends upon.

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    Amount of light entering into the camera depends upon aperture setting the camera.

The refractive index of water is 1.33. What will be speed of light in water ?

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The luminous intensity of 100 W unidirectional bulb is 100 candela. The total luminous flux emitted from bulb will be

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    φ = 4 π I= 4 π = 4 π (100) = 400 π lumen.

Luminous flux and luminous intensity are related as

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    φ = 4 π I is the correct relation.

The intensity produced by along cylindrical light source at a small distance r from the source is proportional to

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RAY OPTICS AND OPTICAL INSTRUMENTS
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