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JEE PHYSICS MCQ: WAVE OPTICS

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Application +4 | -1

Two sources of light of wavelengths

2500 \mathop {\text{A}}\limits^{\text{o}}

and

3500 \mathop {\text{A}}\limits^{\text{o}}

are used in Young's double slit expt. simultaneously. Which orders of fringes of two wavelength patterns coincide?

View answer and explanation

Correct option: B

7 th order of

1 \mathrm{st}

and 5 th order of 2nd

Option B (7 th order of

1 \mathrm{st}

and 5 th order of 2nd) is correct because the 7th fringe of the first wavelength coincides with the 5th fringe of the second wavelength.

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