A convex lens of crown glass (n = 1.525) will behave as a divergent lens if immersed in:

The correct option is C carbon disulphide (n = 1.66)
A lens shows opposite behaviour if ${\mu }_{medium}>{\mu }_{lens}$ i.e., a convergent lens becomes divergent in nature. Hence, a convex lens of crown glass (n = 1.525) will behave as a divergent lens if immersed in carbon disulphide (n = 1.66).