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Asked by sarveshvibrantacademy | 28 Apr, 2019, 14:26: PM
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when θ1 increases slightly, angle of refraction increases slightly at the first surface of incidence.
Since both the refracting surfaces are mutually perpendicular to other, increase of angle of refraction causes decrease
of angle of incidence at second surface. (geometrically sum of angle of refraction at first surface and
angle of incidence at second surface is 90°).  Since angle of incidence decreases slihtly, θ2 also decreases slightly
Answered by Thiyagarajan K | 28 Apr, 2019, 17:08: PM

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