Question

An object is placed at a distance of 2f from a concave mirror of focal length f. What is the magnification of the image?

• A. -1
• B. 1.5
• C. -2
• D. 0

Answer 1

The correct option is A

-1

We know,
2f=c

So, the object is placed at the centre of curvature distance.
Image size will be same as object.
size of image = the size of the object
Magnification = size of image /size of object
=size of image/ size of the image
=1/1
=-1(As the image is inverted)