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Q.

The path of a light ray, from air to three different media A, B and C for a given angle of incidence. Study the diagram, carefully and answer the following questions.


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Will the light be travelling from A to B, does it bend towards or away from the normal?


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a

Towards

b

Away

c

Shows no deflection

d

None 

answer is A.

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Detailed Solution

“Refractive index is the value calculated by the ratio of the speed of the light in vacuum to that in a second medium of greater density.”
The refractive index of A is less than that of B. The light ray bends towards the normal as the ray travels from lower optical density to that of a higher optical density. Thus, when a light ray travels from A to B it bends towards the normal.
 
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