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A monochromatic beam of light falls on Y...

A monochromatic beam of light falls on Young's double slit experiment apparatus as shown in figure. A thin sheet of glass is inserted in front of lower slit `S_(2) (lambda = 600 nm` is wavelength of source)

If central bright fringe is obtained on screen at 'O' then

A

`(mu - 1)t = d sin theta`

B

`(mu - 1)t = d cos theta`

C

`(mu t) = d theta`

D

`(t)/((mu - 1)) = (d)/(sin theta)`

Text Solution

Verified by Experts

The correct Answer is:
A
Totla path difference `Delta x = (mu - 1)t-d sin theta`. For central maxima `Delta x = 0` hence `(mu - 1)t = d sin theta`
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