NCERT Class XII Chapter
Wave Optics
Questions With Solutions
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Question : 7
Total: 21
In a double-slit experiment the angular width of a fringe is found to be 0.2° on a screen placed 1 m away. The wavelength of light used is 600 nm. What will be the angular width of the fringe if the entire experimental apparatus is immersed in water? Take refractive index of water to be 4/3.
Solution:
Angular width θ =
θ =
With air between slit and screen
θ = 0.2 =
With water as the medium between slit and screen.
λ' = λ/µ
Angular width θ′ = λ′/d ...(ii)
Dividing
θ =
With air between slit and screen
θ = 0.2 =
With water as the medium between slit and screen.
λ' = λ/µ
Angular width θ′ = λ′/d ...(ii)
Dividing
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