A thin oil film spread over water appears colourful in light, will the oil film appear colourful if it is thick ?

Explanation

To determine whether a thick oil film spread over water will appear colorful, we need to analyze the phenomenon of thin film interference. Here’s a step-by-step solution:

### Step 1: Understand Thin Film Interference
Thin film interference occurs when light waves reflect off the boundaries of a thin film, such as oil on water. When light hits the film, some of it is reflected off the top surface, and some is refracted into the film, where it reflects off the bottom surface and exits back into the air. The two reflected rays can interfere with each other, leading to constructive or destructive interference, which results in the colorful appearance.

**Hint:** Remember that interference depends on the thickness of the film and the wavelength of light.

### Step 2: Analyze the Effect of Thickness
...