A virtual image is formed 20.5 cm from a concave mirror having a radius of curvature of 34.5 cm. (a) Find the position of the object. Your response is within 10% of the correct value. This may be due to roundoff error, or you accuracy to minimize roundoff error. cm in front of the mirror (b).What is. the magnification of the mirror? Enter a number. is within 10% of the correct value. This may be due to roundoff error, or you accuracy to minimize roundoff error.