Question

8. To observe refraction and lateral deviation of a beam of light incident obliquely on a glass slab.

Answer 1

Thank you for asking this question. This is an experiment and I think it will be little difficult to explain the whole procedure here.

First of all you will fix a white paper sheet on a drawing board.

Then you will take a glass slab put it symmetrically in the middle of the paper and mark its boundary ABCD

Normal point will be drawn at point Q  on face AB and draw a line PQ making an angle i with the normal.

Now you will fix two pins at points 1 and 2 on the line PQ at distances 1 cm

Now you will remove the glass slab

Draw straight line RS through points 3 and 4 to represent emergent ray.

Join QR to represent refracted ray.

Now draw normal at point R on face DC and measure angle e

Draw TU perpendicular to RS. TU measures lateral displacement d

Take another set for different angle of incident and measure the lateral displacement

These are the final conclusion for the experiment.

Angle of incidence (i) = Angle of emergence (e).

The lateral displacement increases with the increase in the thickness of the slab.

The lateral displacement increases with the angle of incidence (i).

If there is any confusion please leave a comment below.