What is a plane mirror?

What is a plane mirror?

• A. A curved mirror
• B. A mirror with a flat surface
• C. A lens that focuses light
• D. A material that absorbs light

Answer: (B)

A plane mirror is a mirror with a flat surface that reflects light. The light follows the rule of reflection: the angle at which light hits the surface equals the angle it bounces off. Because the surface is flat, the image appears behind the mirror at the same distance as the object is in front, and it is upright and the same size as the object. It doesn’t bend light to focus it like a lens, and it isn’t a material that absorbs light. A curved mirror would have a rounded surface and behave differently, while a lens or an absorbing material would do other things with light.

A plane mirror is a mirror with a flat surface that reflects light. The light follows the rule of reflection: the angle at which light hits the surface equals the angle it bounces off. Because the surface is flat, the image appears behind the mirror at the same distance as the object is in front, and it is upright and the same size as the object. It doesn’t bend light to focus it like a lens, and it isn’t a material that absorbs light. A curved mirror would have a rounded surface and behave differently, while a lens or an absorbing material would do other things with light.