A mirror is behind a cloth and cannot be seen. Determine its type, whether the image is real or virtual, and the sign of the magnification M. Choose your answer from below:
a) concave mirror, real image; M is positive
b) concave mirror, virtual image; M is positive
c) convex mirror, virtual image; M is positive
d) convex mirror, real image; M is positive
e) None of these: Write your own
Explain your answer choice to get partial credit in case your answer choice is incorrect. Write your answer the following way: Choice: Explanation: