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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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Topics: Wave Optics
(101)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A car moves from X to Y with a uniform speed v(u) and returns to Y with a uniform speed
- In potentiometer experiment, a cell of emf 1.25V gives balancing length of 30 cm
- A spring balance is attached to the ceiling of a lift.A man hangs his bag on the spring
- Pure Si at 300 k has equal electrons (nₑ) and hole (nh) concentrations
- The distance of the closest approach of an alpha particle fired at a nucleus
Topics: Wave Optics (101)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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