Question

What should be the position of an object in front of a concave mirror to get a real image having the same size as that of the object ?

• A. at F
• B. between F and C
• C. between F and P
• D. at C

Answer 1

Answer:

D. at C

To get a real image of the same size as the object with a concave mirror, the object must be placed at the center of curvature (C).

This is one of the standard cases of image formation by a concave mirror. When an object is placed at the center of curvature:

• Position of the image: The image is formed at the same position, which is also at the center of curvature (C).

• Nature of the image: The image is real and inverted.

• Size of the image: The image has the same size as the object.

Ray Diagram

As shown in the diagram, a ray of light parallel to the principal axis passes through the focus (F) after reflection. A ray of light passing through the focus (F) becomes parallel to the principal axis after reflection. These two reflected rays intersect at the center of curvature (C), forming an image of the same size as the object.

Therefore, the correct answer is (D) at C.