Question

A Ray of light is incident at 32 degree on a glass ice interface after refraction it is deviated by three degree calculate critical angle for ice ,if critical angle for glass is 42 degree​

Answer 1

When the angle of incidence reaches a value known as the critical angle the refracted rays travel along the surface of the medium or in other words are refracted to an angle of 90 degrees.

Explanation:

• When light travels from one medium to another it changes speed and is refracted.
• If the light rays are travelling for a less dense material to a dense medium they are refracted towards the normal and if they are travelling from a dense to less dense medium they are refracted away from the normal.
• For total internal reflection to occur the light must travel from a dense medium to a less dense medium.
• Example is glass to air or water to air.
• As the angle of incidence increases so does the angle of refraction.
• When the angle of incidence reaches a value known as the critical angle the refracted rays travel along the surface of the medium or in other words are refracted to an angle of 90 degrees.
• The critical angle for the angle of incidence in glass is 42 degrees.

To Learn More...

1.If angle of incidence for a light ray in air be 45 and angle of refraction in glass be 30 . Find refractive index of glass with respect to air ?

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