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A ray of light incident at an angle theta on a refracting face of a prism emerges from the other face normally. If the angle of the prism is 5^@ and the prism is made of a material of refractive index 1.5, the angle of incidence is |
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Answer» `7.5^@` `delta=(mu-1)A=(1.5-1)xx5^@` `THEREFORE delta=0.5xx5^@=2.5^@` Here angle of refraction is `5^@` at the first SURFACE and so from the geometry of figure,  `delta=theta-r` `therefore theta=delta+r` `2.5^@+5.0^@` `7.5^@` |
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