Question

according to castesion sign of convension is a focal length of concave mirror positive or negetive
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Answer 1

Answer:

The focal length of a concave mirror is negative and that of a convex mirror is positive. This is because the focus of a concave mirror is in front of the mirror, on the left side, and the focus of a convex mirror is behind the mirror, on the right side.

Answer 2

Explanation:

The focal length of a concave mirror, with a real focus, is always positive as is measured against the direction of incident light.

The focal length of a concave mirror, with a real focus, is always positive as is measured against the direction of incident light.The focal length of a convex mirror, with a virtual focus, is always negative as is measured along the direction of the incident light.

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