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In a Young's double slit experiment, the...

In a Young's double slit experiment, the slits are placed 0.320 mm apart. Light of wavelength `lambda =500` nm is incident on the slits. The total number of bright fringes that are observed in the angular range `-30^(@)le theta le 30^(@)` is :

A

320

B

641

C

640

D

321

Text Solution

Verified by Experts

The correct Answer is:
B
`d sin theta = n lambda `
` n = (0.32 xx 10 ^(-3) xx 1//2)/( 500 xx 10^(-9)) = (2500)/(8) = 320`
`:. n_("max") = 320`
`:.` Total number of maxima between the two lines
`= 2 xx 320 + 1 = 641 `
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