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A monochromatic ray of light enters into a glass $\operatorname{slab}(n=1.5)$ along the normal to the surface. The angle of deviation of the refracted ray is
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The correct answer is:
$0^{\circ}$
When a ray of light enters a glass slab along the normal to the surface, it passes straight without deviation. So, angle of deviation is zero $\left(0^{\circ}\right)$.
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