Alens with focal length +12 mm has an object 5 mm away from it that is 3 mm tall. how far from the lens is the image formed, is it virtual or real, and how tall is the image?

8.57 mm far from lens

image is virtual and height is 1.714 mm

Explanation:

given data

focal length f = 12 mm

object distance p = 5 mm

tall  = 3 mm

to find out

How far from the lens and is it virtual or real and  tall is the image

solution

we apply here lens formula

1/f = 1/p + 1/q

put all value and find q

1/12 = 1/5 + 1/q

q = 8.57 mm

so 8.57 mm far from lens

and

M = - q / p

M = - 8.57 / 5

M = - 1.714

so image is virtual and height is 1.714 mm

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me