Refraction in a Glass Slab
Refraction in a Glass Slab
Refraction of Light:
It is a process of bending of light ray when passing from one medium to another.This bending of light depends not only on the the refractive indices of the two media but also depends on the angle of incidence.
Refraction in a Glass Slab:
Suppose a ray of light AB traveling through air with refractive index ( = 1 ) incident at an
(angle of incidence) on the upper surface of a transparent rectangular slab. This ray gets refracted by an
(angle of refraction) at the upper surface and moves along BC known as refracted ray.
 |
As the ray of light travels from air (rarer medium) to the glass slab (denser medium) therefore it bends towards the normal which means that .
According to Snell's law
.......[ I ]
When the refracted ray ,BC reaches the lower surface SR,. is incident at an (angle of incidence) . This ray gets refracted by an
(angle of refraction) This refracted ray that comes out of the glass slab is known emergent ray. In this case light ray travels from glass slab (denser medium) to the air (rarer medium) and bends away from the normal which means
.
When a ray of light enters a glass slab from air | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following are correct ? (a) In the case of glass slab the ray gets refracted at the upper surface and then moves inside the glass slab is known as refracted ray. (b) In the case of glass slab the ray that comes out of the glass slab is known emergent ray. (c) In the case of glass slab the lateral distance between the incident ray and emergent ray is known as lateral displacement. | |||
| Right Option : D | |||
| View Explanation | |||
In the case of glass slab the ray after refraction at the upper surface and moves inside the glass slab and is known as _________________ . | |||
| Right Option : B | |||
| View Explanation | |||
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