Electromagnetic Waves and Electromagnetic Spectrum

EM Waves

Transverse Waves without a medium. They travel in electrical and magnetic fields

Electromagnetic Spectrum

name for the range of electromagnetic waves when placed in order of frequency and wavelength.

Radio Waves

lowest frequency and longest wavelength

Gamma Rays

highest frequency and the shortest wavelength

Visible Lights

the only EM Waves that we can see

Cosmic Rays

another high-energy radiation from energetic cosmic events in space. These rays are produced by stars such as the sun. One of the examples of Cosmic Rays are aurora borealis or the northern lights.

X-Rays

are wavelengths with 10 nm to 0.01m, these rays have enough energy to penetrate deep into tissues and can cause damage to cells

Rays

light waves that travels in straight lines

Reflection

is the change in direction of a wave front at an interface between two different media so that the wave front returns into the medium from which it originated

Refraction

is the change in direction of wave propagation due to a change in its transmission medium

Dispersion

a phenomenon in which the phase velocity of a wave depends on its frequency

Diffraction

is the spreading of light after it passes around the edge of an object

Absorption

the light wave could be absorbed by the object, in which case its energy is converted to heat (THERMAL ENERGY).

Human Eye

produces a real, inverted image in the retina.

Camera

forms a real and inverted image on a photographic film

Compound Microscope

forms a real, inverted, and enlarged image near the focus of the eyepiece

eyepiece of A Telescope

works as magnifier, therefore Telescopes produces enlarged images