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Two isosceles prism of prism angle A and...

Two isosceles prism of prism angle `A` and refractive index `mu` are placed with their bases touching each other. This system can act as a crude converging lens. The focal length of the lens for `A=10^(@),mu=1.5` and a ray of light incident on a prims at a height of `1` cm from its base, is approximately.

A

`11.5` cm

B

`23.0`cm

C

zero

D

`5.75`cm

Text Solution

Verified by Experts

The correct Answer is:
A
For small angles `tan delta=h/f`

Also `tan delta=delta=(mu-1)A`
`h/((mu-1)A)=f`
`10^(0)=(pi)/18` radian
`f=(1xx18)/(0.5xx3.14)=11.5cm`
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