Question

Assertion:
Thin film such as soap bubble or a thin layer of oil on water shows beautiful colors when illuminated by white light.

Reason:
It happens due to the interference of light reflected from the upper surface of the thin film.

• A. Both Assertion and Reason are correct, and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion
• C. Assertion is correct, but Reason is incorrect
• D. Assertion is incorrect, but Reason is correct

Answer 1

The correct option is C Assertion is correct, but Reason is incorrect

Thin films show colors when illuminated by white light because the reflected rays from the upper and the lower surface of the film interfere constructively to give domination of some color for a particular value of thickness at a point.

Hence, $\left(\text{C}\right)$ is the correct answer.