The refractive index of air and crown glass are 1.0003 and 1.52 respectively.A ray of light enters the air through crown glass.i) In the above situation how the light changes its direction. Give reason.ii) If a ray of light enters the water medium from air then how does the direction changes.(refractive index of water : 1.33)ii) Refractive index of diamond is 2.42. Interpret this statement.v) Define the term refractive index.
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Answer: (I) The light bends away from the normal.
Explanation : This is because the speed of light increases on moving from crown glass to air as it is moving from denser to rarer medium.
(ii) it bends towards the normal because the speed of light decreases.
(III) the ratio of sine of angle of incidence and sine of angle of refraction for diamond is 2.42.
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