Two very narrow slits are illuminated by monochromatic coherent light in air tha

Question

Two very narrow slits are illuminated by monochromatic coherent light in air that has wavelength 560 nm and the interference pattern is observed on a screen that is 4m from the slits. The first interference minima ae located at +/- 58 degrees on either side of the central bright band. You then immerse the slits and the space between the slits and the screen in a transparent liquid and illuminate the slits with the same light. Now the first minima on either side of the central bright band occur at +/- 36 degrees.

What is the distance between the two slits?

What is the refractive index of the liquid?

Explanation / Answer

d= lambda/(2sin(58))=3.3*10^-7 m

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