Wavelength

Perceiving Light

RRodds Cones

2) Why do objects appear in different colors and in different shades of the same color?

3) Why are most emergency vehicles and school buses painted yellowish or greenish colors?

1) How does light reach our eyes?

Does light travel in a straight line?

Why do we see blue?

Red

Red

Orange

Orange

Yellow

Yellow

Green

Green

Blue

Blue

Violet

Violet

Reflec

ted

White Light

Absorbed

Tran

smitt

ed

Reflection

Refraction

Refraction

Red Orange Yellow Green Blue Violet

“ROY G BIV”Spectroscope - Uses diffraction grating

Definitions

• Spectroscope – a device that produces a color spectrum

• Spectrometer – an instrument that measures the intensity of light

Lunar Planetary Institute

ON

Calculations:

Standard Voltage

Graph

Results

Collect Data

Calculate % Reflectance

Graph Data

Collect Data For Light & Dark Blue Felt

Human Vision

Primary Colors Complementary Colors

Can You Explain?

• What is happening to the light that strikes each of these jars?

Let’s Check Our Answers

• Transmission• Absorption• Reflection (Scattering)• Color Selective

Absorption, Transmission, and Reflection

Double Reflection

Oil Film on Water

Double Reflection

Color Magic

Red, Blue, and Green Filters

Perfect Filters

• Red removes green and blue• Green removes red and blue• Blue removes red and ½ green