1.

In Young.s double slit experiment, using monochromatic light of wavelength lamda , the intensity of lightat a point on the screen where path difference is lamdais K units. The intensity of light at a point where path difference is lamda//3 is.

Answer»

4K
K
2K
`K//4`

Solution :`I= 4I_thetacos^2phi `
` phi = ( 2 pi)/( LAMDA)D = (2 pi)/(3 )`
` I= 4I_0 1/4= I_0 …… (1) `
` "//"^(LY)I=K= 4I_0…..(2)`
Fromeqns1 and 2wearriveat option(D )


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