An object of size 2.0 cm is placed perpendicular to the principal axis of a concave mirror. The distance of the object from the mirror equals to the radius of curvature. The size of the image will be

a)0.5 cm 
b)1.5 cm
c)1.0 cm
d)2.0 cm

Dear student,
The distance of the object from the mirror equals to the radius of curvature.
That implies that the object is at the centre of curvature.
We know that when an object is placed that the centre of curvature in a concave mirror-

• the image formed is real and inverted
• the image will be formed at centre of curvature and will be of the same size.

Here, size of the object= 2.0 cm
Therefore, size of the image will be aso 2.0 cm
So, the correct option is d) 2.0 cm
Regards