NAEST 2020 | Screening Test Previous Year Question: Refraction Through a Glass Slab – Normals #NAEST

NAEST 2020 Screening Test | Previous Year Question – Refraction from a Glass Slab (Optics)

Question 1:
Treat the lighted path on the paper after the slit as a narrow light beam. The paper is fixed on a horizontal table.
Let A be the point where the light falls on the slab and B be the point from where the light emerges from the slab.

The normal to the surface of the slab:
a. Is vertical at A and horizontal at B
b. Is vertical at B and horizontal at A
c. Is horizontal both at A and at B
d. Is vertical both at A and at B

Question 2:
The video is the same as in the previous question. Under dim light conditions, you can observe that part of the incident beam is reflected at the first surface.
Let:
x = angle between the incident beam and the normal at A
y = angle between the reflected beam and the normal at A
z = angle between the emergent beam and the normal at B

Choose the correct option:
a. x = y = z
b. x = y ≠ z
c. x ≠ y = z
d. x ≠ y, y ≠ z

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