Question

You want to create a spotlight that will shine a bright beam of light with all of the light rays parallel to each other. you have a large concave spherical mirror and a small lightbulb. where should you place the lightbulb?

Answer 1

At the focal length of the mirror. The reason why is when parallel light rays hit the mirror, it converges at the focal point. So if we want parallel light rays, it would make sense to put it at the focal point.

Answer 2

At the focal point of the mirror.

Step-by-step explanation:

The light bulb should be placed at the focal point of the concave mirror because when the light rays hit the concave mirror, they will not converge and they will not diverge, the light rays will be reflected in parallel lines.