A light ray is reflected off the surface of a plane mirror at 40 to the normal. What is the angle of reflection of the reflected ray?
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30o
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40o
0%
50o
0%
60o
Q.2.
What determines how fast light travels in a medium?
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Size of the medium
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Shape of the medium
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Refractive index of the medium
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Colour of the medium
Q.3.
What equation can be used to calculate the refractive index of a substance?
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Refractive index = 1 x sin c
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Refractive index = 1 / sin c
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Refractive index = 1 – sin c
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Refractive index = 2 / sin c
Q.4.
The critical angle of diamond is 24 degrees. What is its refractive index?
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0.6
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4.9
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2.4
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0.4
Q.5.
Another equation for calculating the refractive index of a substance is ...
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Refractive index = sin i x sin r
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Refractive index = sin r / sin i
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Refractive index = sin c / sin r
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Refractive index = sin i / sin r
Q.6.
If light enters a medium with an angle of incidence of 23 degrees and has an angle of refraction of 18 degrees, what is the refractive index of the medium?
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0.12
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1.3
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0.8
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0.7
Q.7.
If a shiny surface is not smooth, what will happen to light rays incident upon it?
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They will be reflected in numerous directions
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They will be reflected towards one point
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They will pass straight through the material
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The light will be absorbed by the material
Q.8.
When a light ray travels from air into glass, what can you say about the size of the angle of refraction compared to the angle of incidence?
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It is bigger
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It is the same
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It is smaller
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It is zero
Q.9.
What direction does the incident ray bend when travelling from glass to air?
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Towards the normal
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Towards the glass
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Towards the sea
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Away from the normal
Q.10.
Which of the following can reflect light?
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Mirror
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Water
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Glass
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All of the above
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