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QNEET-2017-Ph-983: NEET 2017 Physics - Class 12 NEET-2017-Ph-983 Solution: Young's double slit experiment is first performed in air and…
Young's double slit experiment is first performed in air and then in a medium other than air. It is found that 8th bright fringe in the medium lies where 5th dark fringe lies in air. The refractive index of the medium is nearly 1.59 1.69 1.78 1.25
Multiple Choice Options
- A 1.59
- B 1.69
- C 1.78
- D 1.25
Step-by-Step Verified Solution
Position of 8 th bright fringe in medium
x = 8 _ m D _ d
Position of 5 th dark fringe in air,
x' = ( 5 _ 1 2 ) _ a i r D d = 4.5 _ a i r D d
According to question
8 _ m D _ d = 4.5 _ a i r D d
_ _ = 1.78