Question

The focal length of converging lens is 10 cm. An object is kept at
30 cm from the centre of lens. Where will be the image be formed​

Answer 1

Answer:

Explanation: The image is formed at 15 cm from the optical centre of convex lens and is formed between focus and centre of curvature of that lens. Image formed is real and inverted.

Answer 2

Answer:

The image is formed at 15 cm on other side of the lens.

Explanation:

Given that,

Focal length = 10 cm

Object distance = 30 cm

We need to calculate the image distance

Using formula of lens

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

Put the value into the formula

$\dfrac{1}{10}=\dfrac{1}{v}-\dfrac{1}{-30}$

$\dfrac{1}{v}=\dfrac{1}{10}-\dfrac{1}{30}$

$\dfrac{1}{v}=\dfrac{1}{15}$

$v=15\ cm$

Hence, The image is formed at 15 cm on other side of the lens.