Question

the image of a object is placed at a distance U=30cm of the same side of lens and image is formed at V=10cm .find the focal lenght​

Answer 1

Answer:

Please mark as brainiest first and the answer is 40.

Answer 2

Answer:

7.5 cm

Explanation:

(1/v)-(1/u)= (1/f)..... lens equation

put values v=10, u= -30

(1/10)+(1/30)= (1/f)

(3+1)/30=(1/f)

f= 30/4= 7.5cm