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Can you tell me the answer for this question?
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Asked by subbukum | 04 Feb, 2020, 11:58: AM
answered-by-expert Expert Answer
WHen a ray fall normally on the face of the slab the value of angle of incidence and angle of refraction is zero.
Laws of refractions:
1.The incident ray, refracted ray and the normal ray all lie in the same plane.
2. The ratio of sine of angle of incidence and sine of angle of refraction is constant.
 
Out of medium I and II, the medium in which the light bends greater,  towards the normal, is optically denser medium. Here the medium which is making 20 degree with the normal is optically denser.
Answered by Utkarsh Lokhande | 04 Feb, 2020, 12:52: PM

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