Mirrors & Lenses: Understanding Virtual and Real Images

[pearlz4eva]

Homework Statement

True or False
1. A single diverging lens can only make a virtual image.
2. When parallel rays strike a concave spherical mirror with radius R they are focussed through a point R from the mirror.
3. An object placed at distance greater than the focal length of a converging lens will always make a real inverted image.
4. If a projector makes a perfect image on a screen, but the image is too large, you need a lens with a greater focal length.



2. The attempt at a solution

I thought all statements were False, but that was incorrect.

 

[berkeman]

Homework Statement

True or False
1. A single diverging lens can only make a virtual image.
2. When parallel rays strike a concave spherical mirror with radius R they are focussed through a point R from the mirror.
3. An object placed at distance greater than the focal length of a converging lens will always make a real inverted image.
4. If a projector makes a perfect image on a screen, but the image is too large, you need a lens with a greater focal length.



2. The attempt at a solution

I thought all statements were False, but that was incorrect.

Welcome to the PF.

What is your reasoning on each? Why do you think each is false? If you show us your work, we can better help you understand.