MAHE Manipal B.Sc Nursing 2025
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Refraction Through A Glass Slab is considered one the most difficult concept.
7 Questions around this concept.
A ray of light enters a rectangular slab of refractive index
Consider an object O placed a distance d in front of a glass slab of thickness "t" and
refractive index
So for the refraction at the surface (1)
Apparent depth,
Similarly for the refraction at the surface (2)
Apparent depth,
As you observe, The refracting surfaces of a glass slab are parallel to each other. When a light ray passes through a glass slab it is refracted twice at the two parallel faces and finally emerges out parallel to its incident direction.
i.e. the ray undergoes no deviation (
the object appears to be shifted towards the slab by the distance known as apparent shift or Normal shift.
And the apparent shift= OA-I2A
If the slab is placed in the medium of refractive index
In the above figure Incident, ray AO is an incident on the EF surface of the slab at an angle of incident i, and PB is the emergent ray emerging out of the HG surface of the slab.
for the surface EF
Applying Snell's law at the surface EF and HG
i.e the emergent ray is parallel to the incident ray.
If
Then
If
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