According to Newton’s first law of motion, the state of motion of an object does not change as long as the net force acting on the object is .

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

What is a good example of instantaneous speed

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.