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A solar cooker, really a concave mirror pointed at the Sun, focuses the Sun's rays 17.2...

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?
_____ cm
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Answer #1
Sun rays focusses f = 17.2 cm
radius of the soherical surface from the mirror is  f = r / 2
                                                                r = 17.2 cm * 2
                                                                   = 34.4 cm
                                                         
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