Select the correct statement about the magnitude of the magnification of a concave mirror if the object is beyond the center of curvature c (do > r).
a) the magnitude of the magnification of a concave mirror is equal to 1.
b) the magnitude of the magnification of a concave mirror is greater than 1.
c) the magnitude of the magnification of a concave mirror is less than 1.

c) The magnitude of the magnification of a concave mirror is less than 1

Explanation:

we know

the mirror formula is given as:

  ..............(1)

also

magnification (m) of mirror is given as:

. ..... (2)

where,

v = image distance

u = object distance

r = Radius of curvature of the mirror

Now

from (2)

substituting in (1), we get

or

    ..............(3)

now it is given that object is beyond the center of the the curvature

thus,

⇒     ................(4)

comparing the (3) and (4), we have

or

or

or

⇒

Hence, the magnification is less than 1