Sunglasses have lenses made of dark glass that reduce the amount of daylight entering your eyes. design a test using a light meter and a lamp to find out if the two lenses in a pair of sunglasses are equally effective.

Use the ratio form of kepler’s third law, = , and the data provided to determine the time it takes mars to orbit the sun. round your answer to the nearest tenth. earth’s orbital period = 1.0 earth year earth’s distance from the sun = 1.0 au mars’s distance from the sun = 1.5 au it takes mars about ⇒ 1.8 earth years to orbit the sun.