Question

The colours on the soap bubble is due to

• A. Interference
• B. Polarisation
• C. Diffraction
• D. Reflection

Answer 1

The correct option is A

Interference

Explanation for Correct Answer:

In the case of option A,

1. The colors of a soap bubble come from white light, which carries all the colors of the rainbow.
2. When white light reflects from a soap film, some of the colors get brighter, and others disappear.
3. Some part of the light gets reflected from the other inner surface of the soap bubble and some part of the light is refracted and enters inside the soap bubble.
4. Colors are seen due to interference between waves reflected from the top and bottom of the soap bubble.

Explanation for Incorrect Answer:

In case of option B,

1. Polarization is defined as the property of electromagnetic radiations where the relationship between the direction and magnitude of the vibrating electric field is explained.
2. So, option B is incorrect.

In case of option C,

1. Diffraction of light is the phenomenon of bending light around the corners of small obstacles.
2. When the light comes in contact with an obstacle, diffraction of light takes place.
3. So, option C is incorrect.

In case of option D,

1. The natural phenomenon of bouncing back the light in the same medium on striking the surface of an object is termed the Reflection of light.
2. In soap, bubble light gets refracted and reflected but the color of the bubble is due to interference and not reflection.
3. So, option D is incorrect.

Hence option A is the correct answer.