Question: a diverging concave lens or a diverging convex mirror may...
A diverging concave lens or a diverging convex mirror may be used as ... (four answers are correct):
Reading glasses for far-sighted people
Glasses for near-sighted people
The lens in an eye
Store security mirrors
Car side-view mirrors
Flashlight or headlight mirrors
Elements in optical equipment (e.g. camera, microscope)
Make-up or shaving mirrors
Note: I understand three of the choices would be 1) glasses for nearsighted people, 2) store security mirrors, and 3) car side-view mirrors. What is the fourth answer, and please explain why. Thank you!