Question

A pencil is placed on the principal axis at 10 cm from the convex lens . The focal length of the lens is 10 cm. Identify the image formed by the lens.

• A. real, upright, and enlarged.
• B. real, inverted and enlarged.
• C. real, inverted, and smaller.
• D. virtual, upright, and enlarged.
• E. virtual, upright, and smaller.

Answer 1

The correct option is D virtual, upright, and enlarged.

For a convex lens,

$\frac{1}{v}-\frac{1}{u}=\frac{1}{f}$

$⟹\frac{1}{v}=\frac{1}{-10}+\frac{1}{10}$

$⟹v=\infty$

Hence the image is virtual, upright and enlarged.