One of the following does not apply to the concave mirror. That is:

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Focal length is negative

Image distance can be positive or negative

Image distance Is always positive

Height of the image can be positive or negative.

answer is C.

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Detailed Solution

The focal length of a concave mirror is negative by New Cartesian Sign Convention.
Cartesian Sign Convention: In the case of the spherical mirror, all signs are taken from the Pole of the spherical mirror, which is often called the origin or origin point. This sign convention is known as New Cartesian Sign Convention.
The sign is taken as – (negative) from the pole of a spherical mirror towards an object along the principal axis. This means the sign is always taken as – (negative) in front of a spherical mirror. For example, the object's distance is always taken as – (negative) in the case of both types of a spherical mirrors, i.e. concave and convex mirrors.

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