An air bubble in water is shown in this figure, Three rays of light are incident on the air bubble.

The angle of incidence of ray 1 on the air bubble is greater than the critical angle. The angle of incidence of ray 2 on the air bubble is less than the critical angle. Ray 3 is perpendicular to the surface of the bubble.
(i) In figure at the point where ray 1 meets the air bubble, mark
(a) The normal to the surface
(b) The angle of incidence
(ii) Complete the ray diagram to show how all three rays continue after they meet the air bubble.
(iii) Define refractive index of water. If the speed of light in air is $3 \times 10^{8} m s^{- 1}$ and the speed of light in water is $2.2 \times 10^{8} m s^{- 1}$ . Calculate the refractive index of water.

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Solution

i) Ray 1 will undugo total internal refrection.
Ray 2 will rafrack through air.
Ray 3 will undugo no deviation.

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