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Write down the condition for thin film interference. Calculate the position (angular) and the distance between...

Write down the condition for thin film interference. Calculate the position
(angular) and the distance between the 3rd and 4th dark lines of the interference
pattern on the screen when the slits are spaced 0.450 mm apart and are placed 80.0
cm from the screen. The slits are illuminated with coherent light of wavelength
550nm. Also calculate the distance between the 3rd and 4th dark lines when the entire
apparatus was immersed in water. How this separation compares with separation in
air and why? (nwater = 1.333)
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