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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 -A. convergent lensB. divergent lensC. plane glass plateD. like a prism |
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Answer» Correct Answer - 2 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. |
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