Q.

In an Interference pattern of Young’s double slit experiment, we observe the 12th order maxima for wavelength 600 nm at a point on the screen. What order maxima will be visible at the same point, if the source is replaced by light of wavelength 480 nm.

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Detailed Solution

Δx=ydD=m1λ1=m2λ2 ∴m1m2=λ2λ1=480600=4860 ⇒12m2=4860 ∴m2=12×6048=15th
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In an Interference pattern of Young’s double slit experiment, we observe the 12th order maxima for wavelength 600 nm at a point on the screen. What order maxima will be visible at the same point, if the source is replaced by light of wavelength 480 nm.