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In Young's double-slit experiment, 30 fr...

In Young's double-slit experiment, 30 fringes are obtained in the field of view of the observing telescope, when the wavelength of light used is `4000 Å`. If we use monochromatic light of wavelength `6000 Å`, the number of fringes obtained in the same field of view is

A

60

B

90

C

40

D

`1.5`

Text Solution

Verified by Experts

The correct Answer is:
C
As, `x = n_(1)beta_(1) = n_(2)beta_(2) = n_(1)lambda_(1) = n_(2)lambda_(2)`
`:. n_(2) = (n_(1)lambda_(1))/(lambda_(2)) = (60xx4000)/(6000) = 40`
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