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Q. 7

Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 954

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Short Answer

Narrow, bright fringes are observed on a screen behind a diffraction grating. The entire experiment is then immersed in water. Do the fringes on the screen get closer together, get farther apart, remain the same, or disappear? Explain.

The edges of the fringes are getting closer to each other.

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Step by Step Solution

Step 1: Introduction

The dazzling fringe occurs when the crest of one waveform corresponds with the crest of another. The dark fringe occurs when the trough of one wave coincides with the trough of another, resulting in dark fringes.

Step 2: Explanation

We already know that . When the experiment is submerged in water, the frequency of the light stays constant, but the wavelengths drops as the movement slows. As the wavelength of light decreases, the fringes become closer together.

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