SATHEE: Optics Question 866

Optics Question 866

Question: A wedged shaped air film having an angle of 40 second is illuminated by a monochromatic light and the fringes are observed vertically down through a microscope. The fringe separation between two consecutive bright fringes is 0.12 cm. The wavelength of light is:

Options:

A) $5545 \overset{o}{A}$

B) $6025 \overset{o}{A}$

C) $4925 \overset{o}{A}$

D) $4655 \overset{o}{A}$

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Answer:

Correct Answer: D

Solution:

[d] $β = \frac{λ}{2 μ \tan α} ≃ \frac{λ}{2 μ α}$

$∴ λ = β \times 2 μ α$

$= 0.12 \times 10^{- 2} \times 2 \times 1 \times (\frac{40}{60 \times 60} \times \frac{π}{180})$

$= 4655 \overset{o}{A}$ .

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Optics Question 866

Question: A wedged shaped air film having an angle of 40 second is illuminated by a monochromatic light and the fringes are observed vertically down through a microscope. The fringe separation between two consecutive bright fringes is 0.12 cm. The wavelength of light is:

Options:

Answer:

Solution:

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