Question

An object is situated at a distance of 15cm from a convex lens of focal length 30 cm. The position of the image formed by it will be

• A. - 30 cm
• B. 30 cm
• C. -10 cm
• D. 10 cm

Answer 1

Answer: (A)

- 30 cm

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

$\frac{1}{v}-\frac{1}{-15}=\frac{1}{30}$

$\frac{1}{v}=\frac{1}{30}-\frac{1}{15}$

$\frac{1}{v}=\frac{-1}{30}$

$v=-30cm$