1. A camera with a 80 mm focal length lens is used to photograph the sun and moon. What is the height of the image of the sun on the film, given the sun is 1.4010⁶ km in diameter and is 1.5010⁸ km away?

2. The figure illustrates a number of optical lenses made of glass with index of refraction n. An equation from which the focal length of each lens in air can be calculated is: 1/f = ( n-1 )( 1/r1 1/r2 ) where r1 and r2 are the magnitudes of the radii of curvature of the lens surfaces.

\f26.7 cm R