Question

A mirror forms an irrect image 30cm from the object,and 1/3 its height.where will the mirror be situated?what is the radius of curvature?is the object real?is the mirror concave or convex?.

Answer 1

Be sure you understand two optics principles: the focal length of a convex mirror is NEGATIVE (by convention) and R / 2 = f.

Find f, take its negative, plug in the mirror equation and obtain Di = - 24 cm. This indicates that the image is virtual (as it should be in a convex mirror), is erect (as all virtual images are), is diminished (as it should be) and INSIDE the mirror as it should be.