Question

Pick the wrong answer in the context with rainbow.
(1) When the light rays undergo two internal reflections in a water drop, a secondary rainbow is formed.
(2) The order of colours is reversed in the secondary rainbow.
(3) An observer can see a rainbow when his front is towards the sun.
(4) Rainbow is a combined effect of dispersion, refraction and reflection of sunlight.

Answer 1

Answer:

1. False because it will again change into white light
2. False
3. True because it enable us to see
4. True

Answer 2

An observer can see a rainbow when his front is towards the sun.

Correct answer - 3

Step by step explanation:

• Rainbow is the combined effect of dispersion(separation of visual light beam into its constituent colors), refraction(change in direction of wave) and reflection of sun rays.

• When the light rays experience two internal reflections in a decrease of water, a secondary rainbow is created .

• The sequence of colors in the secondary rainbow is inverted.

• If his face is towards the sky, a person can see a rainbow.

Hence, correct answer -3