Recent content by Clyner791

In air: an object is placed 50 cm from the lens (concave) with a focal length 20cm. This produces an image 33.33 cm from the lens (again in air) So, what change (if any) will occur to the focal length of the lens

I think the focal length will get larger. My reason for thinking this is because light rays diverge less in a more viscous medium? (I.e. they refract less?).

My question is as follows: Does the focal length of a concave lens change when put into a medium such as water? Initially the focal length of the lens is 20 cm in air. Would it get larger or small in water?

Two capacitors have the same plate separation, but one has square plates and the other has circular plates. The square plates are a length L on each side, and the diameter of the circular plate is L. The capacitors have the same capacitance because they contain different dielectric materials...