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CBSE Class 10 Answered

Why light rays do not bend or refract when they meet the glass slab perpendicularly? (Pls ans theoratically and dont say it is bcs i is 0)
Asked by marygreata3 | 16 Aug, 2020, 07:05: PM
Expert Answer

If the incident ray falls on the glass slab perpendicularly or normally, it goes inside the slab un-deviated i.e there is no bending of light because of the following reasons:

As the incident rays passes along the normal to the surface, the angle of incidence becomes zero.
It is a known fact that angle of incidence and the angle of refraction are related to each other and are governed by Snell's Law i.e
 
begin mathsize 12px style Refractive space Index equals fraction numerator Sin space straight i over denominator Sin space straight r end fraction Refractive space Index cross times Sin space straight r equals Sin space 0 Refractive space Index cross times Sin space straight r equals 0 As space Refractive space Index not equal to 0 comma space Sin space straight r equals 0 straight r equals 0 degree end style
This explains why the angle of refraction is zero when the incident light falls normal or perpendicular to the glass slab.

Hope this helps!!!
Answered by Shiwani Sawant | 17 Aug, 2020, 11:45: PM

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