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A narrow parallel beam of light is incid...

A narrow parallel beam of light is incident on a transparent sphere of refractive index `n` if the beam finally gets focused at a point situated at a distance=`2xx("radius of sphere")` form the center of the sphere then find `n`?

A

`(4)/(3)`

B

`(3)/(2)`

C

`-(4)/(6)`

D

`(-2)/(3)`

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The correct Answer is:
A
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