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General
Easy
Question
A student is asked to measure the wavelength of monochromatic light. He sets up the apparatus sketched below. S1 , S2 , S3 are narrow parallel slits, L is a sodium lamp and M is a microscope eyepiece. The student fails to observe interference fringes. Your first advice to him will be
- increase the width of S1
- decrease the distance between S2 and S3
- replace L with a white light source
- replace M with a telescope (E) make S2 and S3 wider.
The correct answer is: decrease the distance between S2 and S3
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