# CCDs and Telescopes

**How much more light can a 2-metre telescope collect than a 1-metre?**

- Twice as much
- No, think about the area of the mirror (rather than its radius)
- Four times as much
- Yes, this is correct - the area is four times greater
- Eight times as much
- No, think about the area of the mirror
- 1.41 times as much (the square root of 2)
- No, think about the area of the mirror