Question

8. Suggest a method to find approximate focal length of a concave mirror ​

Answer 1

Explanation:

place the concave mirror in front of a wall(better if there is a window). allow sunlight to fall on the mirror.after reflection sunlight will converge at a point. measure this distance with ruler

Answer 2

Answer:

if the object at infinity then the length between pole and image is focal length

Explanation:

1/f=1/v-1/u