Light, the essence of life itself. Without it we simply would have nothing. Light is the main source of energy for all living organisms. Plants, main sustainers of life, are crucial in this conversion process and need light for photosynthesis that enables them to make their own food and food for others.

Uses of Light Energy

• Food formation.
• Growth of the human body.
• Regulation of Physiology.
• Sight and vision.
• Heat and temperature.
• Drying & evaporation.
• For speed regulation.
• Source of electrical energy.

It helps us to see things. It helps plants to make food and grow. It is used in power satellites and space stations.

Lesson Summary

• Visible light.
• Infrared waves.
• X-rays.
• Ultraviolet light.
• Gamma rays.
• Radio waves.
• Microwaves.

Sun

The primary properties of visible light are intensity, propagation-direction, frequency or wavelength spectrum and polarization.

Properties of light

• Reflection of light.
• Refraction of light.
• Diffraction of light.
• Interference of light.
• Polarization of light.
• Dispersion of light.
• Scattering of light.

Light energy is a kind of kinetic energy with the ability to make types of light visible to human eyes. Light is defined as a form of electromagnetic radiation emitted by hot objects like lasers, bulbs, and the sun. The energy is released in the form of a photon and more photons come out as the substance gets hotter.

Light energy is defined as how nature moves energy at an extremely rapid rate, and it makes up about 99% of the body’s atoms and cells, and signal all body parts to carry out their respective tasks. An example of light energy is the movement of a radio signal.

10 properties of light

• Properties of Light.
• Properties of Light • • • • • • • • • Effects of Materials on Light Reflection Refraction Dispersion Total Internal Reflection Interference Diffraction Scattering of Light Polarization.

Light is a form of electromagnetic radiation with a wavelength which can be detected by the human eye. It is a small part of the electromagnetic spectrum and radiation given off by stars like the sun. Animals can also see light. The study of light, known as optics, is an important research area in modern physics.

Light & Sound

• Science Grade 4.
• Light.
• Optical Devices.
• Sources of Light.
• Light Radiates from a Source.
• Objects that Absorb, Transmit, and/or Reflect Light.
• Bending Light.
• Dispersion of Light.

Terms in this set (14)

• Refraction. Bending of light.
• Reflection. When a wave bounces off an object.
• concave lens. makes objects look smaller.
• convex lens. Makes objects appear bigger.
• optic nerve. the nerve that carries messages from the eye to the brain.
• Retina.
• Pupil.
• Cornea.

What are the Properties of Light?

• Light travels in a straight line.
• The speed of light is faster than sound. Light travels at a speed of 3 x 108 m/s.
• Reflection of light.

Albert Einstein’s special theory of relativity famously dictates that no known object can travel faster than the speed of light in vacuum, which is 299,792 km/s. Unlike objects within space–time, space–time itself can bend, expand or warp at any speed.