Answer: When light rays strike a smooth, opaque surface such as a mirror, most of the rays reflect back forming a virtual image.
Step-by-step explanation:
When light rays strike a smooth surface such as mirror, the light cannot pass through as it is opaque. Most of the light is reflected back. A mirror is made up of glass with highly lustrous metal polished at the back.
The image formed by a mirror is not real as it cannot be obtained on a screen. It is virtual in nature, forms behind the mirror. The image is of same size and at the same distance from the mirror as the object is.