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What is the relation between the refract...

What is the relation between the refractive indices` mu,mu_(1) ` and `mu_(2)` if the behaviour of light rays is shown in Figure.

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a. `mu_(1) lt mu_(2)` , because it is behaving like a divergence lens.
b. `mu_(1)=mu_(2)`, because no refraction is taking place.
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