The source is at some distance from an obstacle. Distance between obstacle and the point of observation is b and wavelength of light is `lambda`. Then
The source is at some distance from an obstacle. Distance between obstacle and the point of observation is b and wavelength of light is `lambda`. Then the average distance of nth Fresnel zone will be at a distance …from the point of observation.
A. `(bn lambda)/(2)`
B. `b-(n lambda)/(2)`
C. `b+(n lambda)/(2)`
D. `b-n lambda`
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Correct Answer - C
The average distance of nth Fresnel zone from observation point will be at a distance `b+(n lambda)/(2)`.
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