Question

magnification produced by a spherical mirror is +4.
identify the mirror
If the position of the object for the
given magnification is 20 cm then
find the focal length?​

Answer 1

Answer:

We know that linear magnification of a convex mirror is always +ive , the given magnification is -ive so 

(1) It is a concave mirror

(2) Image is inverted 

(3) Image is real

(4)As magnification =−3 ,which is greater than 1therefore image is enlarged .