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Q. 7

Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 955

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Short Answer

On a screen behind such a diffracting grating, narrow, bright fringes can be seen. After that, the entire research is submerged in water. Do the screen's fringes get closer together, farther apart, stay the same, or simply disappear? Explain

The fringes move away from each other.

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Step by Step Solution

Step 1: Explanation of the Diffraction Experiment

The diffraction experiment having interference pattern fringes is described by

The experiment is assumed to mean having emptied the air in this equation.

Step 2: The Wavelength Changed

When the identical comparison is made in water, the wavelength changes.

execution for constructive interference.

Step 3:  Substitution

We substitute

The spectral separation is amplified by the same wavelength because water has an index of refraction of , so the fringe moves away from one another.

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