Show that if an object be n times the focal length to the right of principal focus of a concave mirror, the image will be 1/n times the focal length to the right of the focus and the magnification will be 1/n.​

d

explanation:

i think the answer is d. but im not sure!

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