How Do Light Filters Work

Science projection

Light Absorption and Color Filters

When white light shines on a cerise object, all of the colors that grade the white low-cal are absorbed except red, which is reflected. This is why the object appears carmine. A filter is a transparent fabric that absorbs some colors and allows others to pass through.

Light is the only source of color. Color pigments (paints, dyes, or inks) show color by absorbing certain parts of the light spectrum and reflecting the parts that remain. Color filters work the same manner, absorbing sure wavelengths of colour and transmitting the other wavelengths.

A yellow color filter will let through merely yellow and absorb all other colors. So when blue lite is allowed through a blue filter onto a blue object, the object volition still reflect blue and therefore appear blue. But when blue low-cal from a blue filter hits a red object, the blue will be absorbed and no light will be reflected, giving the object an advent of beingness black.

blue filter

Flashlight
Red, bluish, and green construction newspaper
See-through colored cellophane paper
Camera filters in carmine, blue and green
Masking tape or a rubber band

Why did the papers look white, ruby, blue, and green (respectively) in white light?
How did the filters affect the white flashlight beam?
Why did the xanthous and green papers seem to lose their colour when red lite was shined on them?

Darken the room equally much as possible.
Turn on the flashlight and aim information technology at the white newspaper. Detect and record the colour of the paper in the data table.
Repeat stride 2 with the red, blue, and light-green pieces of newspaper.
Place the red filter in front of the axle of the flash light as shown using record or a rubber band to secure the cellophane newspaper filter. Polish the filtered beam on the white, carmine, blue, and light-green papers and record the colors seen.
Repeat using the blue filter and then the green filter. Later on each examination, record the results.

flashlight

Filter Paper	None	Red	Green	Bluish
White
Reddish
Bluish
Dark-green

Identify a filter in front of the light source. Combine two colored filters. Now combine three colors. Experiment with many unlike combinations.

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