1.

The refractive index of glass is 1.5. From a point pinside a glass slab, draw rays PA, PB and PCincident on the glass-air surface at an angle ofincidence 30'. 429 and 60 respectively.(a) In the diagram show the approximate directionof these rays as they emerge out of the slab.(b) What is the angle of refraction for the ray PB ?

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