One slit of a double slit experiment is covered by a thin glass plate of refractive index 1.4 and the other by a thin glass plate of refractive index 1.7. The point on the screen, where central bright

Question

One slit of a double slit experiment is covered by a thin glass plate of refractive index 1.4 and the other by a thin glass plate of refractive index 1.7. The point on the screen, where central bright fringe was formed before the introduction of the glass sheets, is now occupied by the $5^{th}$ bright fringe. Assuming that both the glass plates have same thickness and wavelength of light used is $4800 \overset{˚}{A}$ , find their thickness.

Options:

Answer:

B

Solution:

Shift of 5 fringes: $(μ_{1} - μ_{2}) t = 5 λ$

$t = \frac{5 λ}{1.7 - 1.4} = \frac{0.48 \times 5}{0.3} μ m = 8 μ m$

Answer (B)

TestHub · Accepted Answer

Shift of 5 fringes: ( μ 1 ​ − μ 2 ​ ) t = 5 λ t = 1.7 − 1.4 5 λ ​ = 0.3 0.48 × 5 ​ μ m = 8 μ m Answer (B)

Physics - Wave Optics Question with Solution | TestHub

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