The inherent characteristic of an electromagnetic wave is its frequency. Their frequencies remain unchanged but its wavelength changes when the wave travels from one medium to another. Electromagnetic wave follows the principle of superposition.

YES! Light is made of discrete packets of energy called photons. Photons carry momentum, have no mass, and travel at the speed of light. All light has both particle-like and wave-like properties.

Characteristics of electromagnetic waves As you learned in Wave Motion, all waves have amplitude, wavelength, velocity and frequency.

Electromagnetic waves are members of a family of waves with common properties called the electromagnetic spectrum….All electromagnetic waves:

• are transverse waves;
• can travel through a vacuum ;
• travel at exactly the same speed in a vacuum, the speed of light, 300,000,000 m/s.

Visible light

green

yellow

Readability. Let’s talk about reading on screens. Black text on a white background is best, since the color properties and light are best suited for the human eye. That’s because white reflects every wavelength in the color spectrum.

The larger font size is easier to read and produces far less eye strain.

Dark mode may work to decrease eye strain and dry eye for some people who spend a lot of time staring at screens. However, there’s no conclusive date that proves dark mode works for anything besides extending the battery life of your device. It doesn’t cost anything and won’t hurt your eyes to give dark mode a try.

Unlike ultraviolet (UVA and UVB) light, red light will not burn your eyes, although you may feel a gentle warmth during treatment. But because eyes are extremely photosensitive, damage could occur from too much exposure.