draw a diagram to trace the path of ray of light incident at an angle 40 degree on a rectangular glass slab and also find the angle of refraction
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refer to the link below for the answer to a similar query,
https://www.meritnation.com/ask-answer/question/question-trace-the-path-of-a-ray-of-alight-incident-at-a/light-reflection-and-refraction/11169939
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