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Angle of prism is A and its one surface ...

Angle of prism is `A` and its one surface is silvered. Light rays falling at an angle of incidence `2 A` on first surface return back through the same path after suffering reflection at second silvered surface. Refraction index of the material of prism is

A

`2sinA`

B

`2cosA`

C

`1/2cosA`

D

`tanA`

Text Solution

Verified by Experts

The correct Answer is:
B

Refraction at AB:
`1xxsin2A=musinA`
`2sinAcosA=musinA`
`mu=2cosA`
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  10. Light is incident normally on face AB of a prism as shown in Figure. A...

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  15. A medium is said to be dispersive if

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  17. The angular dispersion produced by a prism

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