Question

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.

• A. Only A is true.
• B. Only B is true.
• C. Both A and B are true.
• D. Both A and B are false.

Answer 1

The correct option is B Only B is true.

Magnification of a concave lens or a convex mirror is always positive because they always form virtual and erect images. It can be negative or positive for a convex lens or a concave mirror.

Positive magnification for virtual images and negative magnification for real images is true only when a single optical device is used. When used as a combination, a virtual and inverted image may be formed. One such example is a compound microscope.