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Answer:
32.Option a) Greater than unity
Refraction is the bending of a wave when it enters a medium where its speed is different. The refraction of light when it passes from a fast medium to a slow medium bends the light ray towards the normal to the boundary between the two media. The amount of bending depends on the indices of refraction of the two media.
Refractive index is the measure of the bending of a ray of light as it passes from one medium to another.
In this case, since ray of light bends towards the normal, when it goes from medium A to medium B, the medium A is rarer and medium B is denser medium. Speed of light in rarer medium (v1 ) is greater than the speed of light in denser medium (v2 ) i..e v1 >v2 Thus refractive index of B relative to A n=v1/ v2 .
⟹ n>1
33. Option B. Refer attachment below.
When light travels from one medium to another, it generally bends, or refracts. The law of refraction gives us a way of predicting the amount of bend. The law of refraction is also known as Snell's law, named for Willobrord Snell, who discovered the law in 1621.
Snell's law gives the relationship between angles of incidence and refraction for a wave impinging on an interface between two media with different index of refraction.
Thus, when a ray of light passes through the rectangular slab, the angle of incidence is equal to angle of emergence and this implies that, the incident ray and the emergent ray are parallel to each other.
Hence, option B is correct.
