Question

The focal length of a concave lens is taken negative true or false​

Answer 1

Answer: The given statement is true.

Focal length is always negative for concave lens.

Focal length is always positive for convex lens.

Explanation:

What is focal length?

The distance of the focus from pole of the mirror is called its focal length.

f = PF

When an object is between the focus and Pole, the image is behind the mirror. It is virtual , upright and magnified.

When an object is placed at Infinity l, the image will be at the focus.

When an object is placed at focus, the image will be formed at infinity.

It is real, inverted and highly magnified.

Answer 2

The given statement is true.

Focal length is always negative for concave lens. Focal length is always positive for convex lens.

hope it helps

mark as brainliest