Question

The lens of a camera has a focal length of 10cm. What must be the distance between the lens and the flim in order to photograph objects at (a) infinity (b) 20cm from the lens

Answer 1

1. At F

2.At C

I hope it helps

Answer 2

It is a camera that's mean it have convex lens

Having focal length =10

So it object at infinity then the image formd at focus that's mean for taking picture of an object the the distance of film need 10cm from the lens

And

In object at 20 cm then the distance of film from lens also 20 cm in opposite direction to the object