Question

What causes change in the colours of the soap or oil films for the given beam of light ?

• A. Angle of incidence
• B. Angle of reflection
• C. Thickness of film
• D. Curvature of the film

Answer 1

The correct option is C Thickness of film

$\begin{array}{c}\text{For viewing interference in oil films or soap bubble,}\\ \text{tickness of film is of the order of wavelength of}\\ \text{light.}\\ \text{: (c) Thickness of film is correct option.}\end{array}$