I NEED HELP I DONT UNDERSTAND THIS. PLEASE ANYONE!!

Reflecting and refracting telescopes are used to gather radiation from space. Which of these statements best explains why a refracting telescope is made smaller than a reflecting telescope?

A: Small lenses cause less distortion in images than big lenses.
B: Small lenses cause more distortion in images than big lenses.
C: Small telescopes gather more radiation from space than big telescopes.
D: Small telescopes produce clearer images of distant objects than big telescopes.

Question

I NEED HELP I DONT UNDERSTAND THIS. PLEASE ANYONE!!

Reflecting and refracting telescopes are used to gather radiation from space. Which of these statements best explains why a refracting telescope is made smaller than a reflecting telescope?
 	
	A: Small lenses cause less distortion in images than big lenses.
	B: Small lenses cause more distortion in images than big lenses.
	C: Small telescopes gather more radiation from space than big telescopes.
	D: Small telescopes produce clearer images of distant objects than big telescopes.

anonymous · Answer

A

anonymous · Answer

@Arcturas are you sure?

anonymous · Answer

@Arcturas I honestly don't know how it's A. Can you please explain if you can?

anonymous · Answer

The greater the diameter of lense that is exposed to incoming light, the greater the amount of spherical aberation (blurring of the image). a smaller aperture ensures the light rays incoming are paraxial. and this makes the image darker but sharper.

anonymous · Answer

So bigger lense make it blurry?

anonymous · Answer

Yes. But bigger telescopes primarily use mirrors because making really big lenses is really hard.

anonymous · Answer

I actually understand the difference now. Thank you so much for your time!! :)