Which of the following statements is correct according to New Cartesian Sign Convention?

Focal length of a concave mirror is positive and that of a convex mirror is negative.

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Focal length of a concave mirror is negative and that of a convex mirror is positive.

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Image distance is always positive for a concave mirror.

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The height of all the real and inverted images is positive.

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Solution

The correct option is B Focal length of a concave mirror is negative and that of a convex mirror is positive.
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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Similar questions

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

Why focal length of convex mirror and convex lens is positive while concave mirror and concave lens negative?

Q. Find out the correct option from the following.
(a) The magnification is positive for all virtual images and is negative for all real images.
(b) The magnification of concave lens and convex mirror is always positive where as the magnification of convex lens and concave mirror can be positive or negative depending on the position of the object before the lens.

Q. 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 distance (v) for a concave mirror
(c) image distance (v) for a convex mirror

One of the following does not apply to a concave mirror. This is : (a) focal length is negative (b) image distance can be positive or negative (c) image distance is always positive (d) height of image can be positive or negative

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