Light of wavelength 633 nm from a helium-neon laser is, Ask an Expert

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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 79 cm from the central maximum on a screen 13 m away.

(a) Find the separation of the slits.

(b) How many interference maxima can be observed?

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