Questions
How much intensity of the image is increased if the diameter of the objective of a telescope is doubled?
a
Two times
b
Four times
c
Eight times
d
Sixteen times
detailed solution
Correct option is B
On doubling the diameter, the area of the objective increases four times. Its light-gathering power increases four times. The brightness of the image also increases four times. Therefore, the intensity of the image increases by four.Talk to our academic expert!
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