Question

Which is the only condition under which a concave mirror forms a virtual and upright image on the principal axis?

a. when an object is placed at the center of curvature on the principal axis

b. when an object is placed between the center of curvature and focal point on the principal axis

c. when an object is placed between the focal point and the vertex of the mirror

d. when an object is placed at the focal point on the principal axis

Answer 1

Take a look here...

hyperphysics.phy-astr.gsu.edu/hbase/geoopt/mirray.html

Answer 2

Thank you(:

Answer 3

So, what's the answer?