Light of wavelength 633 nm from a heliumneon laser is shone normally on a plane containing two

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Light of wavelength 633 nm from a helium–neon laser is shone normally on a plane containing two slits. The first interference maximum is 82 cm from the central maximum on a screen 12 m away.

(a) Find the separation of the slits.

(b) How many interference maxima can be observed?


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