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A monochromatic beam of wavelength � = 640 nm illuminates a double-slit. The separation between the...

A monochromatic beam of wavelength � = 640 nm illuminates a double-slit. The
separation between the two slits equals d = 0.02 mm and the width of each slit is equal
to a = 0.004 mm. (a) How many complete fringes appear between the first minima of
the diffraction envelope to either side of the central maximum? (b) What is the ratio of the
intensity of the third and seventh fringes to that of the central fringe? (c) What is the total
number of observable fringes in such a pattern? Are there any missing fringes? At what
angles do they occur?

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Answer #1

Similarly do it for m= 7.

Find ration of I(7) to I(m) simply by substituting m equal to 7 in the equation provided.

Thanku

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