Rainbow are seen when sunlight is dispersed by raindrops. The light is separated

Question

Rainbow are seen when sunlight is dispersed by raindrops. The light is separated into different colors because they each take different paths through raindrops. A ray of white light is incident on a raindrop. The diagram shows the subsequent path of the red light. Name the effect that is experienced by the red light at A. By drawing a normal to the bubble surface (Figure 3) label an angle of incidence with an i and an angle of refraction with an r. On the diagram (Figure 3) draw the path that a violet ray of light would take, through the raindrop and into the air. State What is meant by critical angle

Explanation / Answer

Here, applying Snells Law

=> n1 * sin(i) = n2 * sin(r)

where, n1 = refractive index of air

             n2 = refractive index of drop of water

             i = angle of incidence

             r = angle of refraction

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