Q12) Light containing two wavelengths λ1 and λ2 falls normally on a plane convex lense of radius of
curvature R resting on a glass plate. If the nth dark ring due to λ1 coincides with the (n+1)th dark ring due
to λ2. Prove that the radius of the nth dark ring to λ1 is
√
λ1λ2R-λ1λ2
Answers
Answer:
This is an important property that tells us about the length of the wave trains emitted by excited Sodium atoms. The longer it is the longer distance over which the wave train can remain in phase between its ends or be coherent. As one observes interference between different parts of a wave this becomes important.
Explanation:
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Answer:
Newton's rings is a phenomenon in which an interference pattern is created by the reflection of light between two surfaces: a spherical surface and an adjacent touching flat surface. It is named after Isaac Newton, who investigated the effect in his 1704 treatise Opticks. When viewed with monochromatic light, Newton's rings appear as a series of concentric, alternating bright and dark rings centered at the point of contact between the two surfaces.