the sun's rays are least direct
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A solar cooker, really a concave mirror pointed at the Sun, focusesthe Sun's rays 15.4 cm in front of the mirror. What is the radiusof the spherical surface from which the mirror was made?cm
A solar cooker, really a concave mirror pointed at the Sun, focuses the Sun's rays 17.2 cm in front of the mirror. What is the radius of the spherical surface from which the mirror was made?
Two campers wish to start a fire during the day. One camper is nearsighted, and one is farsighted. Whose glass should be used to focus the Sun's rays onto some paper to start the fire?
a) either camper
b) nearsighted camper
c) the farsighted camper