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In a young's double slit experiment 15 fringes are observed on a small portion of the screen when light of wavelength 500 nm is used. Ten fringes are observed on the same section of the screen when another light source of wavelength $\lambda$ is used. Then the value of $\lambda$ is ( in nm) _____.
Option: 1 750
Option: 2 650
Option: 3 850
Option: 4 450

Answers (1)

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$15\times 500\times \frac{D}{d}=10\times \lambda _{2}\times \frac{D}{d}$

$\lambda _{2}=15\times 50nm$

$\lambda _{2}=750nm$

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avinash.dongre

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