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Standard XII

Physics

The Effect of Path Difference

In Fresnel's ...

Question

In Fresnel's biprism expt., a mica sheet of refractive index 1.5 and thickness 6 $\times$ 10 $^{- 6}$ m is placed in the path of one of interfering beams as a result of which the central fringe gets shifted through 5 fringe widths. The wavelength of light used is

6000

o A

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8000

o A

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4000

o A

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2000

o A

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Solution

The correct option is C 6000 $o A$
Where n is equivalent number of fringe by which the centre fringe is shifted due to mica sheet
$λ = \frac{(μ - 1) t}{n} = \frac{(1.5 - 1) 6 \times 10^{- 6}}{5} = 6 \times 10^{- 7} m = 6000 o A$

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Similar questions

Q. In Fresnel's bi-prism experiment, a mica sheet of refractive index

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and thickness

6 \times 10^{- 6} m

is placed in the path of one of interfering beams as a result of which the central fringe gets shifted through five fringe widths.The wavelength of light used is

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In placing a thin sheet of mica of thickness $12 \times 10^{- 5} c m$ in the path of one of the interfering to beam in YDSE, the central fringe shifts equal to a fringe width. Find the refractive index of mica. Given $λ = 600 n m$ .

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In Fresnel's biprism expt., a mica sheet of refractive index 1.5 and thickness 6 × 10−6m is placed in the path of one of interfering beams as a result of which the central fringe gets shifted through 5 fringe widths. The wavelength of light used is

The correct option is C 6000 oAWhere n is equivalent number of fringe by which the centre fringe is shifted due to mica sheetλ=(μ−1)tn=(1.5−1)6×10−65=6×10−7m=6000oA

In Fresnel's biprism expt., a mica sheet of refractive index 1.5 and thickness 6 $\times$ 10 $^{- 6}$ m is placed in the path of one of interfering beams as a result of which the central fringe gets shifted through 5 fringe widths. The wavelength of light used is

The correct option is C 6000 $o A$
Where n is equivalent number of fringe by which the centre fringe is shifted due to mica sheet
$λ = \frac{(μ - 1) t}{n} = \frac{(1.5 - 1) 6 \times 10^{- 6}}{5} = 6 \times 10^{- 7} m = 6000 o A$