Question

An 16 m tall vase is located 50 m in front of a lens. An image is produced

20 m away from the lens. What is the focal length?

Answer 1

f = 14.28 m

Step-by-step explanation:

Given that,

Object distance, u = -50 m

The image distance from the lens, v = +20 m

We need to find the focal length of the lens. Let the focal length is f. Using the lens formula,

`(1)/(v)-(1)/(u)=(1)/(f)`

Put all the values,

`(1)/(20)-(1)/((-50))=(1)/(f)\\\\f=14.28\ m`

So, the focal length of the lens is equal to 14.28 m.