Is it true that when a thick glass is placed over some printed paper, the letters appear raised?

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True

False

answer is A.

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Detailed Solution

The above statement is true.
The letters appear raised because of a phenomenon known as refraction. Refraction of light is the bending of the rays of light when it passes from one medium to another. This happens because different media have different optical densities and refractive indices, and thus, the speed of light is different in each one of them. Also, refraction only takes place when the light is incident obliquely on the surface of the medium and not along a normal to it. In this case, refraction takes place at the interface of two media, air and glass. When light passes from glass to air, the light bends away from the normal, causing the letters to appear raised.

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