What type of lens is capable of letting in a lot of light?

The larger lens has more area to collect light, which actually equates to an image more then twice the brightness at a ratio equal to πr² where r equals the radius of the lens. The image would, however, be no larger since the focal length of the lens is that same.

Explanation:

I hope this is understandable :)

all options are correct a) b) c) and d)