LIGHT WAVES Light is an electromagnetic wave Its

• Light is an electromagnetic wave. • Its motion is transverse. • Light

Visible light- the set of light wavelengths that stimulate the retina of the eye.

VISIBLE LIGHT RANGE: Wavelength: 400 nm – 700 nm (1 nm= 1 x 10

SPEED OF LIGHT: c=3 X 8 10 m/s This is the same for all

AS WAVE LENGTH INCREASES, FREQUENCY DECREASES. V = fλ where v is always the

Infrared rays- frequency is lower than visible light. Responsible for heating the earths atmosphere.

Low frequency High frequency Infrared ROY-G-BIV ultraviolet High λ Low energy Low λ high

TERMS Luminous- a body that emits own light.

Transparent- a medium that allows light to travel through it.

PHOTOMETRY The study and measurement of visible light in terms of its perceived brightness

SOURCES OF LIGHT Incandescent lightobject gives off light when heated.

• Neon Light – Light produced when electrons in a tube of gas

Fluorescent light- Ultraviolet rays strike a white powder coating on the inside of the

• Black light- High frequency visible light (purple) which can cause other objects

• Laser light- Light amplification by stimulated emission of radiation

Laser light is monochromatic (one color) and coherent (in phase). This produces a small

Laser Type Wavelength (nm) Argon fluoride (UV) Krypton fluoride (UV) Xenon chloride (UV) 193

1) Medical Field USES FOR • Correcting vision LASERS • surgery • Correcting skin

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LIGHT WAVES

• Light is an electromagnetic wave. • Its motion is transverse. • Light travels in straight lines.

Visible light- the set of light wavelengths that stimulate the retina of the eye. ROY-G-BIV

VISIBLE LIGHT RANGE: Wavelength: 400 nm – 700 nm (1 nm= 1 x 10 -9 m) 4 x 10 -7 m – 7 x 10 -7 m

SPEED OF LIGHT: c=3 X 8 10 m/s This is the same for all electromagnetic waves!!!!

AS WAVE LENGTH INCREASES, FREQUENCY DECREASES. V = fλ where v is always the speed of light. f (Hz) λ (m)

ELECTROMAGNETIC SPECTRUM

Infrared rays- frequency is lower than visible light. Responsible for heating the earths atmosphere. (less then 4. 3 x 1014 Hz) Ultraviolet rays- frequency higher than visible light. Responsible for skin cancer. (greater than 7 x 1014 Hz)

Low frequency High frequency Infrared ROY-G-BIV ultraviolet High λ Low energy Low λ high energy velocity is always 3 x 108 m/s

TERMS Luminous- a body that emits own light.

Illuminated- Body that reflects light.

Transparent- a medium that allows light to travel through it.

Translucent- distorts light.

Opaque- reflects or absorbs light.

PHOTOMETRY The study and measurement of visible light in terms of its perceived brightness to human vision.

SOURCES OF LIGHT Incandescent lightobject gives off light when heated.

• Neon Light – Light produced when electrons in a tube of gas are excited.

Fluorescent light- Ultraviolet rays strike a white powder coating on the inside of the bulb causing it to glow.

• Black light- High frequency visible light (purple) which can cause other objects to fluoresce or glow.

LED- light emitting diode

• Laser light- Light amplification by stimulated emission of radiation

Laser light is monochromatic (one color) and coherent (in phase). This produces a small beam instead of scattered light https: //www. youtube. com/watch? v=UG 85 Vg. LOd. PA

Laser Type Wavelength (nm) Argon fluoride (UV) Krypton fluoride (UV) Xenon chloride (UV) 193 248 308 Nitrogen (UV) Argon (blue) Argon (green) Helium neon (red) Rhodamine 6 G dye (tunable) Ruby (Cr. Al. O 3) (red) Nd: Yag (NIR) Carbon dioxide (FIR) 337 488 514 543 633 570 -650 694 10600

1) Medical Field USES FOR • Correcting vision LASERS • surgery • Correcting skin imperfections 2) Electronics: • CD and DVD players ( and blue ray discs) • Supermarket Scanners • Laser light shows 3) Fiber optics: computers, internet, phones, cable TV- for transferring information and data. 4) Industry: Cutting, blasting, and welding