"The extent of bending of the ray of light at the
opposite parallel faces AB (air-glass interface)
and CD (glass-air interface) of the rectangular
glass slab is equal and opposite." What is the meaning of this sentence?
Answers
Explanation:
For understanding the refraction of light through a glass slab let us consider the above figure consider the figure,
Here AO is the light ray travelling in air and incident on glass slab at point O.
When ray enters the glass medium it bends towards the normal NN’ that is light ray AO gets refracted on entering the glass medium.
When ray gets refracted it now travels through the glass slab and at point B it comes out of the glass slab.
As ray OB goes from glass medium to air it again gets refracted and bends away from normal N1N'1 and goes in direction BC.
Here AO is the incident ray and BC is the emergent ray and both are parallel to each other and OB is the refracted ray.
Emergent ray BC is parallel to incident ray AO because the extent of bending of the ray of light at the opposite parallel faces which are PQ and SR of the rectangular glass slab is equal and opposite.
In the figure i is the angle of incidence, r is the angle of refraction and e is the angle of emergence.
Angle of incidence and angle of emergence are equal as emergent ray and incident ray are parallel to each other.
When a light ray is incident normally to the interface of two media then there is no bending of light ray and it goes straight through the medium.
Answer:
Explaination of the sentence is given below.
Explanation:
To understand the refraction of light through a glass plate, consider the diagram above.
where AO is a ray of light traveling through air and striking the glass plate at point O.
When a light ray enters the glass medium, it bends towards the normal NN. That is, the AO ray is refracted upon entering the glass medium.
When the ray is refracted, it passes through the glass plate and exits the glass plate at point B.
As the ray OB travels through the glass medium into the air, it is refracted and bent from the normal N1N'1 and proceeds in the direction BC.
where AO is the incoming ray, BC is the outgoing ray, both are parallel to each other, and OB is the refracted ray.
The outgoing ray BC is parallel to the incoming ray AO. This is because the degree of bending of the rays in the opposite parallel planes, which are PQ and SR of the rectangular glass slab, are equal and opposite.
In the figure, i is the angle of incidence, r is the angle of refraction, and e is the angle of emergence.
The incoming and outgoing rays are parallel, so the incident and exit angles are equal.
When a light ray strikes the interface of two media perpendicularly, it does not bend and passes straight through the medium.
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