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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 <img alt="

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)

best_answer

 

 

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

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

\lambda _{2}=750nm

Posted by

avinash.dongre

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