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  • If the distance between the first maxima and fifth minima of a double-slit pattern is 7mm and the slits are separated by 0.15 mm with the screen 50 cm from the slits, then wavelength (in nm) of the

If the distance between the first maxima and fifth minima of a double-slit pattern is 7mm and the slits are separated by 0.15 mm with the screen 50 cm from the slits, then wavelength (in nm) of the light used is

Option: 1

600


Option: 2

525


Option: 3

467


Option: 4

420


Answers (1)

best_answer

Fringe Width is given by

\beta = \frac{\lambda D}{d}
There are  three and a half  fringes from first maxima to the fifth minim as shown,

\Rightarrow \beta = \frac{7mm}{3.5}=2mm\Rightarrow \lambda = \frac{\beta d}{D}= 600nm

Posted by

manish painkra

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