One side of a glass slab is silvered as shown | vedclass

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(A) When a light ray enters a glass slab and reflects off a silvered back surface,it undergoes refraction,reflection,and then refraction again upon ex

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$90$

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(A) When a light ray enters a glass slab and reflects off a silvered back surface,it undergoes refraction,reflection,and then refraction again upon exiting.By Snell's Law,at the first surface: $1 \cdot \sin(45^o) = 1.5 \cdot \sin(r)$,where $r$ is the angle of refraction.Since the back surface is silvered,the ray reflects at an angle $r$ and hits the top surface again at an angle $r$.By the principle of reversibility and symmetry,the ray emerges from the top surface at an angle of emergence $e = i = 45^o$.The incident ray makes an angle of $45^o$ with the normal. The emergent ray also makes an angle of $45^o$ with the normal on the other side of the normal.The total angle between the incident ray and the emergent ray is $45^o + 45^o = 90^o$. Thus,the deviation is $90^o$.

One side of a glass slab is silvered as shown. $A$ ray of light is incident on the other side at an angle of incidence $i = 45^o$. The refractive index of the glass is $1.5$. The deviation of the ray of light from its initial path when it comes out of the slab is......$^o$.

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