1.

In the experiment of refraction through a glass slab, the angle of incidence should be less than 90•.Why ​

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Answer:

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Explanation:

so angle of incidence must be less than 90 degree because angle of incidence doesn't passes through any DEVIATION

ie it is not PERPENDICULAR

moreover if angle of incidence is 90

then angle of refraction must also be 90

which is just impossible

because according to SNELLS law i=r

thus it said that



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