Question

When a ray of light is incident from air, on to a plane parallel faced glass slab, the angle of incidence is

(a) more than the angle of refraction

(b) more than the angle of emergence

(c) less than the angle of refraction

(d) less than the angle of emergence.​

Answer 1

Answer:

The ray of light is incident on the glass slab the ray get refracted twice and comes out from the other surface as the emergent ray.The emergent ray shows a lateral shift from the original path of the light. When the light is passing through the glass its velocity decreases and when comes out of the glass slab its velocity increases and the light ray traces the same direction in the air.

Hence incident and emergent rays are parallel to each other.

Answer 2

Answer: When a light ray incident from air onto a glass, the angle of incidence is more than the angle of refraction.

Explanation:

• When a light ray coming from rarer medium enters into denser medium, the refracted ray bend towards the normal.
• Therefore, the angle of incidence is always greater than the angle of refraction.
• As glass is denser than the air, the angle of incidence is greater than the angle of refraction.