If the index of refraction of a lens is 1.5, how fast does light travel in the lens? m/s. 300 x 108 5.0 x 10-9 2.0 x 108 4.50 x 108

1. how to locate the image in converging(concave) mirror and diverging (convex) mirror with salt. 2. how to locate the image in a converging (convex) lens and diverging (concave) lens with salt.

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)