4.A ray of light is incident normally to the surface of a glass slab placed in air give angle of incidence and angle of refraction in this case.

4.A ray of light is incident normally to the surface of a glass slab p

1.	4.A ray of light is incident normally to the surface of a glass slab placed in air give angle of incidence and angle of refraction in this case.
Answer» The ray of light which is incident normally on a plane glass slab passes undeviated. That is such a ray SUFFERS no bending at the SURFACE because here the angle of INCIDENCE is 0°. THUS if angle of incidence ∠i= 0°, then the angle of refraction ∠r = 0°. And the angle of deviation of the ray will ALSO be 0°.

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4.A ray of light is incident normally to the surface of a glass slab placed in air give angle of incidence and angle of refraction in this case.​

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4.A ray of light is incident normally to the surface of a glass slab placed in air give angle of incidence and angle of refraction in this case.