A convex lens will behave as a concave lens when placed in

 

1) water   2) oil 3 both 4 none

 

i know that it will do so when it will be placed in a medium having higher refractive index then i think answer should be 2  

 

but it is given 3 is it correct if yes tell me how as refractive i of lens > water

 

AFMC 2003 qns

 

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