A two-source interference experiment uses the apparatus shown. What is the main purpose of the single slit?

Question 35

A two-source interference experiment uses the apparatus shown.

What is the main purpose of the single slit?

A to make a narrow beam of light

B to make the same amplitude of light incident on each slit

C to provide coherent light

D to provide monochromatic light

Reference: Past Exam Paper – June 2018 Paper 12 Q29

Solution:

Answer: C.

The purpose of the single slit is to provide coherent light.

Coherent light have a constant phase difference.

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