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MIRROR PHYSICS

How It Works UK

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Issue 200

Reflect on the science of light bouncing off smooth and shiny surfaces

- AILSA HARVEY

MIRROR PHYSICS

The first mirrors date to around 6,000 BCE, but people have used reflections in natural features such as puddles for many thousands of years. When you look into a mirror, the reflection looking back at you is a life-size, exact visual copy. The angle at which you face the mirror determines what reflection you see - just as if you were to throw a ball at a wall, the angle at which it returns is equal to the angle it hits the wall at. Because the sides of an object line up exactly with the sides of the reflected image, the mirror image is a horizontally flipped version of reality. Your brain interprets the mirror image of you as another person who has turned to face towards you. When you lift your left arm, for example, it appears as if the mirror image of you is raising their right.

Light only behaves in this way when it interacts with a smooth, reflective surface.

How It Works UK से और कहानियाँ

How It Works UK

How It Works UK

UNCANNY'S DANNY ROBINS

The creator and host of the BBC's Uncanny series tells us about his most chilling experiences while researching the show, and writing a ghost book for children

time to read

4 mins

Issue 208

How It Works UK

How It Works UK

HOW FEATHERS GROW

A bird's proteinaceous plumage comes from the same source as our hair

time to read

1 mins

Issue 208

How It Works UK

How It Works UK

New EV battery technology could power 500-mile road trips on a 12-minute charge

Scientists have used a neat chemistry trick to tackle a major challenge facing future batteries.

time to read

2 mins

Issue 208

How It Works UK

How It Works UK

HOW AIR PURIFIERS WORK

These filtration devices clean a room's air of particles that can make a person sick

time to read

1 min

Issue 208

How It Works UK

How It Works UK

Chinese scientists hunt for alien radio signals in a 'potentially habitable' star system

TRAPPIST-1 is a red dwarf star located about 40 light years away that hosts seven Earth-sized rocky planets, with at least three orbiting in the habitable zone where liquid water could exist.

time to read

2 mins

Issue 208

How It Works UK

How It Works UK

WHAT HAPPENS WHEN WE DIE?

Our bodies are vessels for life, but in death they undergo a cascade of chemical and biological changes

time to read

3 mins

Issue 208

How It Works UK

How It Works UK

WHY ARE KEYBOARDS QWERTY?

There's a reason why this seemingly random arrangement of letters is widely used on keyboard layouts

time to read

1 min

Issue 208

How It Works UK

How It Works UK

A 'quasi-moon' discovered in Earth orbit may have been hiding for decades

A new paper describes a possible 'quasi-moon' of Earth, an interloping asteroid that may have been following our planet around for decades, undetected.

time to read

1 mins

Issue 208

How It Works UK

How It Works UK

WHAT'S AN ANTI-DRONE GUN?

How these devices intercept and disable unmanned aerial vehicles

time to read

1 mins

Issue 208

How It Works UK

How It Works UK

Dozens of mysterious blobs discovered inside Mars may be 'failed planets'

Giant impact structures, including the potential remains of ancient ‘protoplanets’, may be lurking deep beneath the surface of Mars.

time to read

2 mins

Issue 208

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