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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.
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A spring has time period T. It is cut into n equal parts. The time period of each part
- A drum of radius R and mass M, rolls down without slipping along an inclined plane
- Initial pressure and volume of a gas are P and 800cc. If the final volume is 100cc
- The point of suspension λ of a simple pendulum with normal time period T₁ is moving
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Topics: Wave Optics (101)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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