For a spherical mirror situation, you have determined that s = 12 cm and s' = 93 cm. What is the focal length of the mirror, in cm? Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.

For a spherical mirror situation, you have determined that s = 12 cm and s' = 93 cm. What is the focal length of the mirror, in cm? Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.