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A convex lens of refractive index mug is...

A convex lens of refractive index `mu_g` is held in a transparent medium of refractive index `mu_m` If course of rays is as shown in Fig., how are `mu_g and mu_m` related ?
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As the rays suffer no deviation in paqssing through the lens, therefore, `mu_(g) = mu_(m)`.
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