First slide

Ray optics

Question

How much intensity of the image is increased if the diameter of the objective of a telescope is doubled?

Easy

A

Two times
B

Four times
C

Eight times
D

Sixteen times

Solution

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.

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