Question

PLEASE HELP ME WITH THIS.......

An object 15cm high is 30cm from a pinhole camera.if the height of the image formed at the back of the camera is 10cm,the image distance is?

Answer 1

TO solve this problem, we simply need to use ratio and proportion. From the statement problem we can say the ratio height : distance, so that: (let us say that X is the image distance)

15 cm : 30 cm = 10 cm : X

We know that the symbol : means division so:

15 cm / 30 cm = 10 cm / X

X = 10 cm * 30 cm / 15 cm

X = 20 cm

So the image distance is 20 cm