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
.
According to Snell's law
.......[ II ]
The two surfaces PQ and RS are parallel to each other so the normal at the two surface are also parallel to each other. and BC is the transversal cutting them so
................[ III ] [Alternate angles]
From II and III we get
Taking the reciprocal we get
.......[ IV ]
From Equation I and IV we get
But they are corresponding angles, as they are equal so we can say that the incident ray is parallel to emergent ray but is laterally didsplaced.This lateral distance between the incident ray and emergent ray is known as lateral displacement.
A light ray makes an angle of reflection 60, when it reflects from a plane reflecting sheet. The angle of deviation will be __________________ | |||
| Right Option : D | |||
| View Explanation | |||
When a ray of light enters a glass slab from air | |||
| Right Option : D | |||
| View Explanation | |||
In the case of glass slab the lateral displacement it depends on the following factors like .
| |||
| Right Option : D | |||
| View Explanation | |||
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