Assertion (A): The focal length of the concave mirror is negative.
Reason (R): From sign convention, distances measured from pole towards the object are taken as negative.

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Giving reasons, state the 'signs' (positive or negative) which can be given to the following : (a) object distance (u) for a concave mirror or convex mirror (b) image distances (v) for a concave mirror (c) image distances (v) for a convex mirror

Q. According to New Cartesian Sign Convention:

(a) focal length of concave mirror is positive and that of convex mirror is negative
(b) focal length of both concave and convex mirrors is positive
(c) focal length of both concave and convex mirrors is negative
(d) focal length of concave mirror is negative and that of convex mirror is positive

Q. An object is placed at

60 c m

from the pole of a concave mirror whose focal length is

20 c m

. What is the image distance as per sign convention ?

is negative sign applicable for object distance, focal length and image distance in the case of a concave mirror always?

Q. Assertion :Magnification of a convex mirror is always positive, but that of a concave mirror may be both positive or negative. Reason: It depends on the sign convention chosen.

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Assertion (A): The focal length of the concave mirror is negative. Reason (R): From sign convention, distances measured from pole towards the object are taken as negative.

Assertion (A): The focal length of the concave mirror is negative.
Reason (R): From sign convention, distances measured from pole towards the object are taken as negative.