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QNEET-2013-Ph-1500: NEET 2013 Physics - Class 12 NEET-2013-Ph-1500 Solution: In Young's double slit experiment the slits are 2 mm apart and…
In Young's double slit experiment the slits are 2 mm apart and are illuminated by photons of two wavelengths and . At what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other? 4 mm 3 m 8 mm 6 mm
Multiple Choice Options
- A 4 mm
- B 3 m
- C 8 mm
- D 6 mm
Step-by-Step Verified Solution
From the question, n 1 _ 1 = n 2 _ 2
So, n 1 n 2 = _ 2 _ 1 = 10000 12000 = 5 6
Hence, minima n 1 and n 2 are 5 and 6.
X min = n 1 _ 1 D d = 5 ( 12000 _ 10 _ 10 ) 2 2 _ 10 _ 3
= 6 _ 10 �3 m = 6 mm