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A horizontal ray of light passes through...

A horizontal ray of light passes through a prism of `mu = 1.5` whose apex angle is `4^(@)` and then strikes a vertical mirror M as shown. For the ray to become horizontal, either just after reflection from the mirror or finally, the mirror must be rotated through an angle of

Text Solution

Verified by Experts

`delta=A(mu-1)`
`=4((3)/(2)-1)`
`=2^@`
Hence, angle of rotation of mirror `=1^@`
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