Question

the pencil is kept at a distance of 10 cm from a convex lens of focal length 15 CM the distance of image of the pencil from the lens is​

Answer 1

Answer:

Hello mate✌✌✌

Given,

u = -10 cm

f = +15 cm

v = ?

Now,

$\frac{1}{f} = \frac{1}{v} - \frac{1}{u} \\ \frac{1}{v} = \frac{1}{f} + \frac{1}{u} \\ \frac{1}{v} = \frac{1}{15} + ( \frac{1}{ - 10} ) \\ \frac{1}{v} = \frac{1}{15} - \frac{1}{10} \\ \frac{1}{v} = \frac{2 - 3}{30} \\ \frac{1}{v} = \frac{ - 1}{30} \\ v = - 30 \: cm$

Hope it helps✌✌✌