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A wavelength of light 5600Å produces 60 ...

A wavelength of light `5600Å` produces 60 fringes. What will be the number of fringes produced at same distance if wavelength of light used is `4800Å`?

A

51

B

70

C

60

D

45

Text Solution

Verified by Experts

The correct Answer is:
B
`lambda_(1)5600, n_(1) 60 n_(2) = ?`
For `lambda_(2)=4800Å`
For same path difference,
`n_(1) lambda_(1)= n_(2) lambda_(2)`
`:.n_(2)=(n_(1) lambda_(1))/(lambda_(2)) =(60xx5600)/(4800) =70`
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