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Question

If a light ray from air enters three different media in such a way that the refracted angles are 450, 300 and 600 respectively. Identify the right statement with respect to the optical density of these media.

A

Optical density is highest for medium 3.

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B

Optical density is highest for medium 2.

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C

Optical density is least for medium 3.

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D

Optical density is least for medium 2.

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Solution

The correct option is B

Optical density is highest for medium 2.


Angle of incidence i is same for all three media. Angle of refraction for the different media are:
rm1=45
rm2=30
rm3=60

Deviation will be highest for medium with highest optical density. Clearly, the deviation is highest (30) for Medium 2. Hence, Medium 2 has highest optical density.

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