Some objects that transmit visible light absorb other wavelengths of light. For example, sunglasses are designed to transmit visible light and absorb ultraviolet light, protecting your eyes. A preview of each game in the learning objective is found below. You can access all of the games on Legends of Learning for free, forever, with a teacher account. A free teacher account also allows you to create playlists of games and assignments for students and track class progress.
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Lamp shades, shower curtains and window blinds are often translucent objects. When white light passes through a coloured filter, all colours are absorbed except for the colour of the filter. For example, an orange filter transmits orange light but absorbs all the other colours.
If white light is shone on an orange filter, only the orange wavelengths will be observed by the human eye. An object appears to be black if it absorbs all the wavelengths of visible light. For example, an object that appears blue in white light will appear black in red light.
This is because the red light contains no blue light for the object to reflect. Any visible light that strikes the object and becomes reflected or transmitted to our eyes will contribute to the color appearance of that object.
So the color is not in the object itself, but in the light that strikes the object and ultimately reaches our eye. The only role that the object plays is that it might contain atoms capable of selectively absorbing one or more frequencies of the visible light that shine upon it.
So if an object absorbs all of the frequencies of visible light except for the frequency associated with green light, then the object will appear green in the presence of ROYGBIV. And if an object absorbs all of the frequencies of visible light except for the frequency associated with blue light, then the object will appear blue in the presence of ROYGBIV.
Consider the two diagrams below. The papers are impregnated with a chemical capable of absorbing one or more of the colors of white light.
Such chemicals that are capable of selectively absorbing one or more frequency of white light are known as pigments. In Example A, the pigment in the sheet of paper is capable of absorbing red, orange, yellow, blue, indigo and violet. In Example B, the pigment in the sheet of paper is capable of absorbing orange, yellow, green, blue, indigo and violet. In each case, whatever color is not absorbed is reflected. Check your understanding of these principles by determining which color s of light are reflected by the paper and what color the paper will appear to an observer.
See Answer Example A: Green will be reflected and so the paper appears green to an observer. Express your understanding of this principle by filling in the blanks in the following diagrams. See Answer Example A: Green will be transmitted and so the object appears green to an observer. Example B: Both green and blue will be transmitted and so the object appears greenish-blue to an observer. The colors perceived of objects are the results of interactions between the various frequencies of visible light waves and the atoms of the materials that objects are made of.
Many objects contain atoms capable of either selectively absorbing, reflecting or transmitting one or more frequencies of light. The frequencies of light that become transmitted or reflected to our eyes will contribute to the color that we perceive. Natural philosophers have long pondered the underlying reasons for color in nature. One common historical belief was that colored objects in nature produce small particles perhaps light particles that subsequently reach our eyes.
Different objects produce different colored particles, thus contributing to their different appearance.
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