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Q. 27

Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 956

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Short Answer

You want to photograph a circular diffraction pattern whose central maximum has a diameter of . You have a helium neon laser and a -diameter pinhole. How far behind the pinhole should you place the screen that’s to be photographed?

Distance for the screen to be photographed,

See the step by step solution

Step by Step Solution

Step1: Aperture Diffraction

When light passes through a narrow opening, such as an aperture with a low f-number, it causes lens diffraction, which is an optical interference.

When the wavelength of light and the size of the opening are about the same, lens diffraction occurs.

Step2: Find the distance 

In the aperture diffraction experiment, the center width is given by,

We can find by solving parametrically.

Step3: Find the distance 

This will be the length in our situation.

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