In a thin film of air between two glass plates, which of the following colors wi

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Question: In a thin film of air between two glass plates, which of the following colors will be least affected by interference? (2022)

Options:

Correct Answer: Red

Exam Year: 2022

Solution:

Red light has the longest wavelength and is least affected by interference effects in thin films compared to shorter wavelengths.

In a thin film of air between two glass plates, which of the following colors will be least affected by interference? (2022)

In a thin film of air between two glass plates, which of the following colors will be least affected by interference? (2022)

Step 1: Understand that light is made up of different colors, each with a different wavelength.
Step 2: Recognize that red light has the longest wavelength compared to other colors like blue or green.
Step 3: Learn that in thin films, such as air between glass plates, light can interfere with itself, causing some colors to be more affected than others.
Step 4: Realize that colors with shorter wavelengths (like blue) are more affected by interference than colors with longer wavelengths (like red).
Step 5: Conclude that red light, having the longest wavelength, will be the least affected by interference in the thin film.

Thin Film Interference – The phenomenon where light waves reflected from the top and bottom surfaces of a thin film interfere with each other, leading to constructive or destructive interference depending on the wavelength of light.
Wavelength and Color – Different colors of light correspond to different wavelengths, with red light having the longest wavelength and being less affected by interference in thin films.