mirror
Definition
A mirror is a surface that reflects light. It is a smooth surface that bounces light back in the same direction that it came from.
The reflection of light from a mirror is governed by the law of reflection, which states that the angle of incidence is equal to the angle of reflection. This means that the angle between the incoming light ray and the normal to the mirror surface is equal to the angle between the reflected light ray and the normal to the mirror surface.
The normal is an imaginary line that is perpendicular to the mirror surface.
The law of reflection can be used to explain why mirrors work. When light hits a mirror, it is reflected back in the same direction that it came from. This is because the angle of incidence is equal to the angle of reflection.
The amount of light that is reflected by a mirror is determined by the material that the mirror is made of. Mirrors that are made of shiny materials, such as silver or aluminium, reflect more light than mirrors that are made of dull materials, such as plastic.
How can the word be used?
The shiny surface of the lake mirrored the clouds in the sky.
Different forms of the word
Noun: A smooth surface that reflects light and images.
Adjective: Reflective.
Verb: To reflect or show something back.
Etymology
The word "mirror" comes from the Latin word "speculum," which means "mirror" or "looking glass." The Latin word "speculum" is derived from the Proto-Indo-European root "spec-," which means "to look.".
The word "mirror" was first used in English in the 13th century. It was originally used to describe a polished metal surface that reflected light.
Question
What is a mirror used for?
AQA Science Exam Question and Answer
Question:
Explain how mirrors work and discuss their applications in everyday life and scientific fields. Provide examples of how mirrors' reflective properties contribute to technological advancements.
Answer:
Mirrors are surfaces that reflect light in a way that preserves much of its original quality. This reflection occurs due to the interaction between light and the mirror's smooth surface, where incident light rays bounce off at the same angle as they hit the mirror. This phenomenon, known as specular reflection, allows mirrors to create accurate images.
Mirrors find numerous applications in everyday life. In personal grooming, mirrors help us see ourselves clearly and adjust our appearance. In architecture, they enhance the perception of space and light in interior design. Scientifically, mirrors are pivotal in optical instruments like telescopes and microscopes, aiding in magnification and precise observations.
In technology, mirrors' reflective properties contribute to advancements. Laser technology employs mirrors to direct and focus laser beams. Fibre-optic communication systems use reflective coatings on mirrors to transmit light signals over long distances with minimal loss. In solar power, mirrors are used in concentrated solar power plants to focus sunlight onto a single point, generating heat for electricity production.
Mirrors also play a role in artistic expression, with their reflective properties being used in various forms of art and visual design.