# In Young'S Double-slit Experiment, the Two Slits Are Separated by a Distance of 1.5 Mm, and the Screen is Placed 1 M Away from the Plane of the Slits. a Beam of Light Consisting of Two Wavelengths - Physics

Short Note

In Young's double-slit experiment, the two slits are separated by a distance of 1.5 mm, and the screen is placed 1 m away from the plane of the slits. A beam of light consisting of two wavelengths of 650 nm and 520 nm is used to obtain interference fringes.
Find the distance of the third bright fringe for λ = 520 nm on the screen from the central maximum.

#### Solution

Third bright fringe for λ1 = 520 nm is given by

"x"_3 = (3lamda"D")/"d" = (3 xx 520 xx 10^-9 xx 1)/(1.5 xx 10^-3) = 1.04 xx 10^-3"m"

= 1.04 mm.

Concept: Interference of Light Waves and Young’S Experiment
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