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Physics - Wave Optics Question with Solution | TestHub

PhysicsWave OpticsThin film interferenceHard2 minQB

PhysicsHardnumerical

Passage / Comprehension

The Newton's ring experiment involves placing a convex lens on a flat glass plate and shining monochromatic light on lens. A concave shaped air film is formed between the lens and plate. The light incident from top reflects from bottom surface of the top lens and the top surface of the flat plate.\\

\\ The result is a series of concentric rings that alternate between bright and dark, with a dark spot at the center.

Radius of curvature of curved surface of the lens is $R = 2 m$ then path difference between two waves for the bright ring of radius $r = 2 mm$ is nearly (in $μ m$ )

Answer:

2.00

Solution:

Path difference between the two reflected waves: $Δ x = 2 t = \frac{r ^{2}}{R}$

$= \frac{( 2 \times 1 0 ^{- 3} ) ^{2}}{2} = 2 \times 1 0^{- 6} m = 2 μ m$

Answer 2.00

Stream:JEESubject:PhysicsTopic:Wave OpticsSubtopic:Thin film interference

⏱ 2mℹ️ Source: QB

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