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A visible object that is not a light source is any other object in the universe. Objects that are not light sources reflect light and are thus made to be visible.
Examples include:
- planets
- people
- the moon
- cars
- dogs
- flowers
- books
- rocks, either in daylight, or else illuminated by a flashlight
- a light bulb or LED with the power switched off
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What happens to visible light when it strikes an object?
When visible light strikes an object, it can be absorbed, transmitted, or reflected. The color of the object is determined by which wavelengths of visible light are reflected back to our eyes. Objects that appear white reflect most of the visible light, while objects that appear black absorb most of the visible light.
Is Jupiter a source of light?
No, Jupiter is not a source of light. It reflects light from the Sun, making it visible from Earth.
How does visible light interact with an object?
Visible light interacts with an object by either being absorbed, transmitted, or reflected. The color of the object is determined by the wavelengths of light that are reflected off its surface. When light is absorbed, it can cause the object to heat up. Transmitted light passes through the object without being absorbed or reflected.
What are two sources of visible light waves?
A primary light source is one that actually produces light, such as a light bulb or the sun. A secondary light source in one that ONLY reflects the light produced by a primary light source. It doesn't produce light itself, such as a mirror or the moon.
What is a lumen?
A lumen is a unit used to measure the total amount of visible light emitted by a source, like a light bulb or flashlight. It indicates how bright the light appears to the human eye. The higher the lumen value, the brighter the light.
