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Answer in Optics for Kundan #87330

Author:
February 20th, 2023

The condition for interference is

“{2}{t}={m}{lambda} (1)”

where t is the thickness of the air wedge at a distance x from the point of contact of the glass plates.

θ is the angle between the plates in radians (this angle is small, so tan θ = θ in radians). In this case, we got

“theta=frac{t}{x} (2)”

So

“2{theta}{x}={m}{lambda} (3)”

We got

“frac{m}{x}=frac{2theta}{lambda} (4)”

20” is equal to 9.59×10-5 radians

Using (4) we get 3.29 fringes/cm

Answer:

3.29 fringes/cm

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