[CPMT 1988]
A) If $ n _{1}=n _{2}=n _{g} $
B) If $ n _{1}=n _{2} $ and $ n _{1}<n _{g} $
C) If $ n _{1}=n _{2} $ and $ n _{1}>n _{g} $
D) Under no circumstances
Correct Answer: C
If $ n _{l}>n _{g} $ then the lens will be in denser medium. Hence its nature will change and the convex lens will behave like a concave lens.
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