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JEE PHYSICS MCQ: WAVE OPTICS

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Application +4 | -1

{n^{th}}

Bright fringe if red light

\left( {{\lambda _1} = 7500\mathop \mathrm{A}\limits^ \circ } \right)

coincides with

{\left( {n + 1} \right)^{th}}

bright fringe of green light

\left( {{\lambda _2} = 6000\mathop \mathrm{A}\limits^ \circ } \right)

. The value of

n = ?

View answer and explanation

Correct option: A

4

Option A (4) is correct because the condition for the coincidence of bright fringes is

n\lambda_1 = (n+1)\lambda_2

, which can be solved for n.

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