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1. A double slit apparatus is held 1.2 m from a screen. Red light (λ =...

1. A double slit apparatus is held 1.2 m from a screen. Red light (λ = 600.0nm) is sent through the double slit and the interference pattern on the screen shows a distance of 12.5cm between the central fringe and tenth order bright fringe. What is the separation of the slits?

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Answer #1

Solution:

For double slit differaction

and

For small angles

thus,

and

Hence,

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