Question

1.Mention two uses of the concave mirror.

1.Discuss the theory of the two methods of determining focal length (f).​

Answer 1

1. telescope

2.

`f = (r)/(2)`

`f = (r)/(2)`f- focal length

`f = (r)/(2)`f- focal length r- the radius of curvature of the mirror

`(1)/(f) = (1)/(p) + (1)/(l)`

p-the distance of the object from the vertex of the mirror

l-the distance of the figure from the vertex of the mirror