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Q 1.
Light is made up of small particles called?
Ans.
Photon.
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Q 2.
How many laws of reflection of light are there?
Ans.
2.
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Q 3.
Velocity of light is minimum in?
Ans.
Glass.
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Q 4.
Ray of light travels in?
Ans.
Straight line.
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Q 5.
SI unit of lens?
Ans.
Dioptre.
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Q 6.
Image formed by a plane mirror is always?
Ans.
Virtual and erect.
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Q 7.
Who give the proposed particle theory of light?
Ans.
Isaac Newton.
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Q 8.
Who found velocity of light?
Ans.
Romer.
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Q 9.
If the temperature of the medium is increased, velocity of light will?
Ans.
Remains same.
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Q 10.
Name the scientist who discovered the electromagnetic property of light?
Ans.
Max well.
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Q 11.
Refractive index of a medium is?
Ans.
Sin i/ sin r.
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Q 12.
Which type of wave is light wave?
Ans.
Transverse wave.
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Q 13.
Magnification of a thinner lens will be?
Ans.
Less.
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Q 14.
The image formed on a cinema screen is an example of?
Ans.
Real image.
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Q 15.
Which lens is called diverging lens?
Ans.
Concave lens.
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Q 16.
A ray of light traveling from a denser medium to a rarer medium speed up and bends?
Ans.
Away from the normal.
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Q 17.
The distance between the pole and the principal focus of a spherical mirror is called?
Ans.
Focal lenght.
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Q 18.
The centre of curvature of a concave mirror lies in?
Ans.
Front of mirror.
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Q 19.
Name the mirror that is used in the highlights in car?
Ans.
Concave mirror.
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Q 20.
Name the mirror used in solar furnace?
Ans.
Concave mirror.
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