observe the givrn figure and name the followings : -a)Angle 1- b) Angle-2- c)Angle-3 d) Angle -4 e) ………….. angle form between incident ray and emergent ray.

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observe the givrn figure and name the followings : -a)Angle 1- b) Angle-2- c)Angle-3 d) Angle -4 e) ………….. angle form between incident ray and emergent ray.

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