A circular disc is placed in front of a narrow source. When the point of observation is at a distance of 1 meter from the disc, then the disc covers first HPZ. The intensity at this point is I 0 . The intensity at a point distance 25 cm from the disc will be
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Number of HPZ covered by the disc at 
Hence the intensity at this point is
or 
Hence the correct answer will be .
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