Mirror

Source: TH

Context: An IIT Kanpur physicist explained mirror science through electron behaviour and quantum mechanics. This coincides with the International Year of Quantum Science and Technology 2025, marking 100 years of its discovery.

About Mirror:

• What is a Mirror?

• A mirror is a smooth surface that reflects most of the light falling on it, forming clear images. It works based on specular reflection, where light bounces at the same angle it arrives.

• A mirror is a smooth surface that reflects most of the light falling on it, forming clear images.

• It works based on specular reflection, where light bounces at the same angle it arrives.

• Material Used in Mirrors:

• Mirrors consist of transparent glass on the front and a thin metallic layer (usually silver or aluminium) on the back. The glass protects the metal and allows light to reach and reflect from the metallic surface.

• Mirrors consist of transparent glass on the front and a thin metallic layer (usually silver or aluminium) on the back.

• The glass protects the metal and allows light to reach and reflect from the metallic surface.

• How Does a Mirror Work?

• Law of Reflection: Light reflects from the metallic surface such that the angle of incidence equals the angle of reflection. Specular vs Diffuse Reflection: Smooth surfaces like mirrors cause specular reflection; rough surfaces cause diffuse scattering. Electron Behaviour: Free-moving electrons in the metal bounce incoming light uniformly, forming a clear virtual image. Virtual Image Formation: Mirrors create a virtual image, appearing behind the mirror where the light seems to originate. Front-Back Reversal: Mirrors don’t flip left-right but they reverse front and back, like a rubber stamp impression.

• Law of Reflection: Light reflects from the metallic surface such that the angle of incidence equals the angle of reflection.

• Specular vs Diffuse Reflection: Smooth surfaces like mirrors cause specular reflection; rough surfaces cause diffuse scattering.

• Electron Behaviour: Free-moving electrons in the metal bounce incoming light uniformly, forming a clear virtual image.

• Virtual Image Formation: Mirrors create a virtual image, appearing behind the mirror where the light seems to originate.

• Front-Back Reversal: Mirrors don’t flip left-right but they reverse front and back, like a rubber stamp impression.

• Limitations of a Mirror:

• Directional Limitations: Only reflects objects within the line of sight; no information from behind the mirror. No Depth Perception: Mirrors do not convey actual depth, making objects appear equidistant from the mirror.

• Directional Limitations: Only reflects objects within the line of sight; no information from behind the mirror.

• No Depth Perception: Mirrors do not convey actual depth, making objects appear equidistant from the mirror.