Question

When a thick glass slab is placed over some printed material, the letters appear to be raised. Why? Also draw a ray diagram for the following.

Answer 1

Heyy Mate Here Is ur Answer....

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.The letters appear raised because of a phenomenon known as refraction. When light travels from one medium to another, it bends (either towards or away from the normal). This happens because different media have different densities and thus, the speed of light is different in each one of them. This causes the light to slow down or speed up, depending on the medium. Note that refraction takes place at the interface of two media, air and glass in this case. Also note that refraction only takes place when the light is incident obliquely to the medium and not along a normal drawn to it.

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. Sorry.I Can't Provide Diagram...

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Answer 2

Explanation:

When we keep the glass slab over some printed matter, the light coming from the letters (after reflection ) face change of medium at glass-air interface. Since glass has more refractive index than air, the light bends away from the normal as it goes out of glass. This apparently causes us to see the letters raised.