2. A lens is being used to look at an object 40cm away. An image appears 20 points 30 cm away. What is the focal length of the lens?

Question

asked Oct 20, 2022 57.5k views

1 Answer

Mawueth · Answer 1 · 2022-10-24T04:24:31+0000

Answer:

f = 17.14 cm

Step-by-step explanation:

Given that,

The object distance, u = -40 cm

The image distance, v = +30 cm

We need to find the focal length of the lens. The lens formula is given by :

$(1)/(v)-(1)/(u)=(1)/(f)\\\\(1)/(f)=(1)/(30)-(1)/((-40))\\\\f=17.14\ cm$

So, the focal length of the lens is 17.14 cm.