Question

What will be the focal length of the lens whose power is  -40.​

Answer 1

Answer:

It will be found to be equal to 6 cm. Thus, object is placed at a distance of 6 cm × 5 = 30 cm from the lens. An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm.

Explanation:

Hope this will help you...

Answer 2

Answer:

0.025m

Explanation:

P=1/f

-40=1/f

f=1/-40

f= -0.025m