Lens
A Transparent Object That Refracts Light To Form Images, Described In Optics.

Focal Length
The Distance From A Lens To Its Focal Point, Determining Image Formation.

Real Image
An Image Formed When Light Rays Converge, Often Produced By A Converging Lens.

Virtual Image
An Image Formed When Light Rays Appear To Diverge From A Point, Often Produced By A Diverging Lens.

Index Of Refraction
A Measure Of How Much A Material Slows Down Light, Affecting Refraction.

Total Internal Reflection
A Phenomenon In Which Light Reflects Completely Within A Medium When Exceeding A Critical Angle.

Fiber Optic Cable
A Cable That Uses Total Internal Reflection To Transmit Light Signals.

Electric Generator
A Device That Converts Mechanical Energy Into Electrical Energy Using Electromagnetic Induction.

Electric Motor
A Device That Converts Electrical Energy Into Mechanical Energy Using Magnetic Forces.

Semiconductor
A Material With Electrical Conductivity Between That Of A Conductor And Insulator, Used In Electronics.