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(A) Refraction is the bending of light when it passes from one transparent medium to another. However,when a light ray is incident normally (perpendic

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(A) Refraction is the bending of light when it passes from one transparent medium to another. However,when a light ray is incident normally (perpendicularly) on the surface of a medium,the angle of incidence $(i)$ is $0^{\circ}$. According to Snell's Law,$n_1 \sin(i) = n_2 \sin(r)$. Since $\sin(0^{\circ}) = 0$,it follows that $\sin(r) = 0$,which means the angle of refraction $(r)$ is also $0^{\circ}$. Therefore,the light ray passes undeviated (without bending) through the glass slab when the angle of incidence is $0^{\circ}$.

What is the angle of incidence for a light ray incident on a glass slab such that it does not undergo refraction (in $^{\circ}$)?

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