Question

A parallel beam of light from a He-Ne laser, with a wavelength 633 nm, falls on...

A parallel beam of light from a He-Ne laser, with a wavelength 633 nm, falls on two very narrow slits 0.066 mm apart.

Part A

How far apart are the fringes in the center of the pattern on a screen 4.1 m away?

Express your answer to two significant figures and include the appropriate units.

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Answer #1

wavelength of beam of light = 633 nm

distance between slit and screen = 4.1 m

seperation between slits = 0.066 mm

fringe width.

Fringe width is the distance between the two adjacent bright (or dark) fringes.

The formula to find fringe width is given as

On plugging the given values, we get

Hence, distance between two adjacent bright (or dark) fringes is 0.03932 m.

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