A convex lens is made out of a substance of 1.2 refractive index. The two surface of lens are convex. If this lens is placed in water whose refractive iondex is 1.33, it will behave as -

Options

A. convergent lens
B. divergent lens
C. plane glass plate
D. like a prism

Answer

2

Explanation

The focal length of lens in water is given by
`f_(l)=(""_(a)mu_(g)-1)/((""_(a)mu_(g))/(""_(a)mu_(l))-1) f_(a)=(1.2-1)/((1.2)/(1.33)-1)` `f_(a)=-(0.2xx1.33)/(0.13) f_(a)`
Hence f is negative and as such it behave as a divergant lens.