NAEST 2020: Refraction from a Glass Slab Optics br Treat the

Question: NAEST 2020: Refraction from a Glass Slab Optics
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

1. is vertical at A and horizontal at B
2. is vertical at B and horizontal at A
3. is horizontal both at A and at B
4. is vertical both at A and at B

Question 2: You can see in the dimmed light conditions that a part of the incident beam is reflected at the first surface. The acute angle made between the incident beam and the normal at A is $x$, that between the reflected beam and the normal at A is $y$ and that between the emergent beam and the normal at B is $z$. Mark the correct option.

1. $x = y = z$
2. $x = y \neq z$
3. $x \neq y = z$
4. $x \neq y, y \neq z$

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