These questions are a warm-up to the numerical questions on SPHERICAL MIRRORS that follow. Use these correct answers to help you work through the problems in this assignment. Notice that these definitions are consistent with our definitions and signs for thin lenses.
(a) A concave mirror is a v mirror and has a focal length, f, that is
(b) A convex mirror is a v mirror and has a focal length, f, that is
(c) An image is if it forms where the (actual) light rays cross, and its image distance, s', is
(d) An image is if it forms where light rays appear to cross, and its image distance, s', is

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a) converging,positive                  b) diverging,negative

c) real,negative                              d) virtual,positive

Explanation:

An image of the concave and convex mirrors are attached with.

We will simply follow the Cartesian - coordinate rules.

According to the question:

(a) A concave mirror is a converging mirror and has a focal length, f, that is negative.

Whenever a light ray from infinity falls on the concave mirror it converges its light at a point call focus.

Ex-Sun seen on a concave mirror like a spot.

(b) A convex mirror is a diverging mirror and has a focal length, f, that is positive.

Focal length is positive as we are considering it towards the positive x-axis.

(c) An image is real if it forms where the (actual) light rays cross, and its image distance, 's', is negative.

Real images are formed when the rays actually meets and most of the time it is towards the negative x-axis of the 2-D plane so the distance 's' is negative.

(d) An image is virtual if it forms where light rays appear to cross, and its image distance, 's', is positive.

So the choices in the blanks are as follows:

a) converging,positive                  b) diverging,negative

c) real,negative                              d) virtual,positive