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Q. Suppose you are 90 cm from a plane mirror. What area of the mirror is used to reflect the rays entering one eye from a point on the tip of your nose if your pupil diameter is 5.5 mm.

Q. Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. The orbital speed of the planets are determined to be 43.3 km/s and 58.6 km/s. The slower planet's orbital period is 7.60 years. (1) What is the mass of the star? (2) What is the orbital period of the faster planet, in years ?

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