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In a Young's double slit experiment 15 ...

In a Young's double slit experiment 15 fringes are observed on a small portion of a screen when light of wave length 500 nm is used. 10 fringes are observed on same section of the screen when another light of wavelength `lambda` is used. The value of `lambda` is (in nm)

A) 750 nm

B) 480 nm

C)1500 nm

D) 300 nm

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