Home Physics Wave and Sound Mix In YDSE, the wavelength of light used is 600…
Physics Wave and Sound Mix MCQ (Single Correct)

In YDSE, the wavelength of light used is 6000Å. If path difference between waves reaching at a point P on screen is 1.5 microns, then at point P –

A
Second bright exist
B
Second dark exist
C
Third dark exist
D
Third bright exist

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Text Solution

Verified by Experts
The correct answer is:
C

The given wavelength of light is .
This is converted to meters as .
The given path difference is microns.
This is converted to meters as .
For a bright fringe, the path difference is given by , where is an integer ( ).

For a dark fringe, the path difference is given by , where is an integer (1,2,3, ...).

The ratio of the path difference to the wavelength is calculated as

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