Optics Question 215

Question: In a diffraction pattern by a wire, on increasing diameter of wire, fringe width

[RPMT 1998]

Options:

A) Decreases

B) Increases

C) Remains unchanged

D) Increasing or decreasing will depend on wavelength

Show Answer

Answer:

Correct Answer: A

Solution:

$ \beta =\frac{\lambda .D}{d} $ where D = distance of screen from wire, d = diameter of wire



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