1.

Green light of wavelength 5100 Å from a narrow slit is incident on a double slit . If the overall separation of 10 fringes on a screen 200 cm away is 2 cm , find slit separation .A. `5xx10^(-4)` mB. `2.5xx10^(-2)` mC. `2.5xx10^(-4)` mD. `5xx10^(-2)` m

Answer» Correct Answer - A
`beta=(2)/(10)cm=2xx10^(-3)m`
As `beta=(lamdaD)/(d)`
`:. d=(lamdaD)/(beta)=(5000xx10^(-10)xx200xx10^(-2))/(2xx10^(-3))`
`=5xx10^(-4)m`


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