Question

The focal length of a convex lens is 15 cm. The image of an object placed 30 cm away from the lens will be:

• A. Real, inverted, of the same size as the object at 30 cm towards the object.
• B. Real, inverted, of the same size as the object at 30 cm on the other side of the object.
• C. Real, inverted, of the same size as the object on the other side of the object at 15 cm.
• D. Virtual, erect, of the same size as the object at 15 cm towards the object.

Hint:

For a convex lens, an object at {twice the focal length} forms an image of the {same size at twice the focal length on the other side}.

Answer 1

The Correct Option is B

For a convex lens, when an object is placed at twice the focal length (2F), the image is real, inverted, and of the same size as the object and is formed at 2F on the other side. Here, \( 2F = 30 \) cm, confirming the answer.