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CGP EDU Academic Team
Published on: September 12, 2026
A monochromatic plane wave of speed c and wavelength λ is diffracted at a small aperture. The diagram illustrates successive wavefronts. After what time will some portion of the wavefront XY reach P?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
This distance between the 2 successive lines (wavefronts) is 
. This is for both the straight and curved lines.
So, wave front XY is separated by a distance of 
from the wavefront that has reached point P.
Distance that needs to be traveled 
Speed of light 
Speed = Distance/Time
Time 
distance 
speed 
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