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Grade: 10
        White light is used in a Young’s double slit experiment. Find the minimum order of the violet fringe (λ = 400 nm) which overlaps with a red fringe (λ = 700 nm). 
5 years ago

Answers : (1)

Jitender Pal
askIITians Faculty
365 Points
							Sol. Let m base th bright fringe of violet light overlaps with n base th bright fringe of red light.
∴ m * 400nm * D/d = n * 700nm * D/d ⇒ m/n = 7/4
⇒ 7 base th bright fringe of violet light overlaps with 4 base th bright fringe of red light (minimum). Also, it can be
seen that 14 base th violet fringe will overlap 8 base th red fringe.
Because, m/n = 7/4 = 14/8.

						
5 years ago
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