(iv) Under what condition does a biconvex lens of glass, having a certain
refractive index, act as a plane glass sheet when immersed in a liquid?
a) When focal length of glass is very small
b) When the refractive index of liquid is more than the refractive index of glass
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A biconvex lens will act like a plane sheet of glass if it is immersed in a liquid having the same index of refraction as itself. In this case, the focal length is zero.
Explanation:
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