Question
Fri February 22, 2013 By: Virendra Jain
 

Mam, please tell me 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?

Expert Reply
Fri February 22, 2013
A biconvex lens of glass having a certain refractive index act as a plane glass sheet when immersed in a liquid having the same index of refraction as itself. In this case, the focal length 1/f =0 or f = infinity.
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