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Point like object is observed using micr...

Point like object is observed using microscope angle subtended by objective with object is `20^(@)` If oil of refractive index 1.4 is kept between object and objective, numerical aperture will be ......

A

`0.24`

B

`0.48`

C

`2.4`

D

`4.8`

Text Solution

Verified by Experts

The correct Answer is:
A
Numerical aperture `n sin beta`
`=1.4 sin ((20)/(2))^(0)`
`=1.4 sin 10^(@)`
`=1.4xx0.1736=0.24`
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