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A prism having an apex angle 4^(@) and r...

A prism having an apex angle `4^(@)` and refractive index 1.5 is located in front of a vertical plane mirror as shown in figure. Through what total angle is the ray is deviated after reflection from the mirror ?

Text Solution

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The deviation suffered by refraction through the small angled prism is given by
`delta=(mu-1)A=(1.5-1)xx4^@=2^@`
This gives the angle of incidence `2^@` at the mirror.
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