Question

1. When an object is placed at a distance of 25 cm from
a mirror, the magnification is m . But the
magnification becomes m2, when the object is
moved 15 cm farther away with respect to the
mi
earlier position. If = 4, then find the focal
---
m2
length of the mirror and what type of mirror it is?​

Answer 1

Answer:

When an object is placed at a distance of 25 cm from a mirror, the magnification is m1. The object is moved 15cm farther away with respect to the earlier position, and the magnification becomes m2. If m1/m2=4 , then calculate the focal length of the mirror. The negative sign shows that the mirror is concave.