Question

Focal length of a concave mirror is
(a) negative
(b) positive
(c) depends on the position of object
(d) depends on the position of image

Answer 1

Answer:

Focal Length:

It is the distance between pole and the focus of the mirror.

It is denoted by 'f'.

Now, coming to the question that is:

Focal length of a concave mirror is

(a) negative

(b) positive✔

(c) depends on the position of object

(d) depends on the position of image

We know that the focal length of concave mirror is positive as the image distance is positive and is on the same side of the mirror as the object. It is real and inverted.

Answer 2

Answer:

focal length of the concave mirror is always negative