You want to photograph a circular diffraction pattern whose central maximum has a diameter of 1.2...

You want to photograph a circular diffraction pattern whose central maximum has a diameter of 1.2 cm . You have a helium-neon laser (?=633nm) and a 9.0×10?2-mm-diameter pinhole.

How far behind the pinhole should you place the viewing screen?

Expert Solution

condition for central maximum

w = (2.44*lambda*L) / D

L = (w*D) / (2.44*lambda)

L = (1.2 cm)(0.09mm) / 2.44*(633nm)

= (1.2*10^-2m)(0.09*10^-3m) / 2.44*(633*10^-9m)

L = 0.69 m (or) 69 cm

genius_generous answered 2 years ago

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