A Slit of Variable Width Illuminated by Light of Wavelength

question 21

Multiple Choice

A slit of variable width illuminated by light of wavelength λ is widened until the first order diffraction minimum moves out to a distance infinitely far away from the brightest location in the central maximum. In terms of the wavelength, the width of the slit is then

• A) 0.
• B) .
• C) λ.
• D) .
• E) 2λ.

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