Question

A Ray of light is incident at an angle i on the surface of the glass slab if its angle of refraction inside the glass block is R then find the relation between I and R assuming that the light enters from the air and emerges into air​

Answer 1

Answer:

angle i < angle r

Explanation:

refer diagram of refraction of light through glass slab

Answer 2

Answer:

The angle of Incidence will be greater than the angle of Refraction.

Explanation:

What is Refraction?

• Refraction is the condition where a wave's direction changes as it transitions from one medium to another due to a change in speed.
• When a wave travels from one medium to another, it bends, which is referred to as refraction.

In our case, (as shown in the figure)

• The refracted ray bends towards the normal as it enters from a rarer to denser medium when the incident ray is incident on the surface of the glass slab from air to the glass making an angle of incidence I with the normal.
• The emergent ray now bends away from the normal as it moves from glass (a denser medium) to air (a rarer medium) and forms an angle of emergence e between the emergent ray and normal after travelling the glass slab and making an angle of incidence r on the other surface of the glass slab.
• The lateral displacement is the perpendicular separation between the incident and emerging rays, which are parallel to one another.

Lateral displacement (d) =  [t sin(i – r)] / cos r = t sin(i – r) sec r

Here sin(i-r) shows, the angle of incidence(i) is greater than the angle of refraction(r).

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