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An interference pattern was made by using red light. If the red light is replaced by blue light, the fringes will becomes
Options
(a) Wider
(b) Narrower
(c) Fainter
(d) Brighter
Correct Answer:
Narrower
Explanation:
Fringe width β = λD / d
β(ʀed) / β(ʙlue) = λ(ʀed) / λ(ʙlue)
λ(ʙlue) is < λ(ʀed)
Therefore, Fringe width with blue light < β with red light.
Fringes become narrower with blue light.
Related Questions: - The momentum of a body is increased by 20%.The percentage increases in kinetic energy
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Topics: Wave Optics
(101)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The momentum of a body is increased by 20%.The percentage increases in kinetic energy
- The number of photons of wavelength of 540 nm emitted per second by an electric bulb
- Two discs of same material and thickness have radii 0.2 m and 0.6 m.
- Initial pressure and volume of a gas are P and 800cc. If the final volume is 100cc
- A light whose frequency is equal to 6.0 x 10¹⁴ Hz is incident on a metal
Topics: Wave Optics (101)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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