A contact lens is made of plastic with an index of refraction of 1.50.The lens has an outer radius of curvature of +2.0 cm and an inner radius of curvature of +2.5 cm.What are the focal length and the power of the lens?
A soda straw is stuck into water at an angle of 36 to the vertical.Looking straight down,what does the angle of the submerged portion of the straw to the vertical appear to be?
A magnifying glass has a convex lens of focal length 15 cm.At what distance from a postage stamp should you hold this lens to get a magnification of +2.0?
Suppose an object is placed 6.0 cm in front of a lens that has a focal length of 4.0 cm.Where is the image located? What are the magnification and the character of the image?