A 5.00 cm tall object is placed 4.25 cm from a lens and produces an image that is 3.00 cm behind the lens. What is the magnification of the lens?

The magnification of the lens is 0.7

Explanation:

We have,

Height of an object is 5 cm

Object is placed 4.25 cm from a lens

Image is formed 3.00 cm behind the lens.

It means u = -4.25 cm

v = -3 cm (behind the lens)

Magnification of the lens is given by :

So, the magnification of the lens is 0.7

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.