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OTP to be sent to Change
Focal length will remains same.
Intensity is directly proportional to the area of the aperture of the lens receiving the light.
Total area of the aperture is,
A = pi * d²/4
Remaining area after covering,
A' = pi *(d²/4 - d²/16) = 3 * pi* d²/16
I/I' = A/A' = 4/3
I' = 3 I/4
Regards
Arun (askIITians forum expert)
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