When taking a photo with a camera in manual mode, one needs to set the
focus, the shutter speed and the exposure. The latter is controlled by ad-
justing the size of aperture, the circular opening that allows light to hit the
film or image sensor when the shutter is opened.
Suppose an aperture opening has a radius of r. What radius R would the
aperture need to be changed to to allow twice as much light through it?
Hint: The area of a circular region is given by A = (pie) r squared.
If twice as much light is to pass through the aperture, the radius needs to be increased so
that the area of the circular aperture doubles.
I honestly do not understand the question and find it confusing. Can someone please help me figure this question out.