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A double-slit interference pattern is created by two narrow slits spaced 0.21 mm apart. The distance...

A double-slit interference pattern is created by two narrow slits spaced 0.21 mm apart. The distance between the first and the fifth minimum on a screen 61 cm behind the slits is 6.2 mm. a. Draw an intensity graph showing the interference pattern and identifying the central maximum, first minimum, fifth minimum, and the distance given in the problem declaration. b. What is the wavelength (in nm) of the light used in this experiment?

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Answer #1

the slits spacing, d = 0.21 mm

distance of screen, D = 61 cm

The condition for minima is given as

So, first minima, n = 0

fifth minima, n = 4

For small angle

From the figure:

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