Me with 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?

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

it's a b and

b. false

explanation:

suppose a rock in free fall is dropped off a cliff. after falling for 5 seconds, its speed would not be 100 m/s.