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  • When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index:<div class='qna-opti

When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index:

Option: 1

equal to that of glass


Option: 2

less than one


Option: 3

greater than that of glass


Option: 4

less than that of glass


Answers (1)

best_answer

As we learnt in

Lensmaker's Formula -

\frac{1}{f}= \left ( \frac{\mu _{2}}{\mu _{1}}-1 \right )\left ( \frac{1}{R_{1}}- \frac{1}{R_{2}}\right )
 

- wherein

\mu _{1}= refractive index of medium of object

\mu _{2}= refractive index of lens

R_{1}\, and \, R_{2} are radius of curvature of two surface

 

 

 

This can happen only when the refractive index of liquid is equal to refractive index of lens.

Posted by

seema garhwal

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