Question

are of light is travelling in a direction perpendicular to the boundary of The parallel glass slab the Ray of light is​

Answer 1

Correct Question:

A ray of light is travelling in a direction perpendicular to the boundary of a parallel glass slab. The ray of light:

(a) refracted towards the normal

(b) refracted away from the normal

(c) Is reflected along the same path

(d) Do not get refracted

Solution:

When a incident ray of light it is falling perpendicular to the air glass interface it means that the angle of incidence is 0°.

Applying Snell's Law at that interface:

$\rm{ \therefore \: \mu1 \times \sin( i) = \mu2 \times \sin(r) }$

$\rm{ = > \: \mu1 \times \sin( {0}^{ \circ} ) = \mu2 \times \sin(r) }$

$\rm{ = > \: \mu1 \times (0) = \mu2 \times \sin(r) }$

$\rm{ = > \: (0) = \mu2 \times \sin(r) }$

$\rm{ = > \: \sin(r) = 0 }$

$\rm{ = > \angle r = {0}^{ \circ} }$

This means that the incident ray does not undergo any refraction and hence does not undergo any deviation.

So, correct option :

Option 4.