Question

Deviation of light through a glass slab

Answer 1

the angle through which it takes place is called angle of deviation

Answer 2

If light falls onto a glass slab,  

Three phenomenon will take place,

• Light is absorbed by the glass
• Energy is dissipated due to heating  
• Refraction of light.

Refraction: The deviation of the light ray while passing from one medium to another is called as refraction. It involves in changing the speed and wavelength of the light.

Reasons:  

Travelling at an angle with a different refractive index.

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