Question

Which of the following does not show any interference pattern? *

Soap bubble

Excessively thin film

A thick film

Wedge Shaped film​

Answer 1

Answer:

It's a thick shaped film!

Explanation:

It's because soaps and thins and wedge films don't give pattern!

Answer 2

An excessively thin film shows no interference pattern.

• Interference pattern refers to the pattern of maxima and minima formed due to the superposition of two waves.
• The interference takes place only when there is some path difference Δx between the two sources.
• When an extremely thin film is used in the experiment, the path difference between the two sources always comes out to be λ/2.

       Here, λ is the wavelength of the light used.

• Since Δx = λ/2 is a condition of minima, no maxima are formed.
• Hence no interference pattern is observed.