Question:
When a mica sheet of thickness 7 microns and μ=1.6 is placed in the path of one of interfering beams in a biprism experiment then the central fringe gets at the position of seventh bright fringe. The wavelength of light used will be
When a mica sheet of thickness 7 microns and μ=1.6 is placed in the path of one of interfering beams in a biprism experiment then the central fringe gets at the position of seventh bright fringe. The wavelength of light used will be
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Mica sheet introduces an optical path difference.
Updated On: Mar 17, 2026
- 4000 \AA
- 5000 \AA
- 6000 \AA
- 7000 \AA
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The Correct Option is B
Solution and Explanation
Shift in fringe,
n=((μ-1)t)/(λ)
7=(1.6-1)×7×10⁻⁶λ
λ=5×10⁻⁷ m=5000
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