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In optical fibre, refractive index of in...

In optical fibre, refractive index of inner part is 1.68 and refractive index of outer part is 1.44. The numerical aperture of the fibre is

A

0.5653

B

0.6653

C

0.7653

D

`08653`

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The correct Answer is:
D
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AAKASH INSTITUTE ENGLISH-RAY OPTICS AND OPTICAL INSTRUMENTS-ASSIGNMENT (SECTION - B)
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