Dispersion occurs when a beam of white light passes through a prism forming a spectrum on a screen, as shown in the diagram - Leaving Cert Physics - Question 8 - 2007
Question 8
Dispersion occurs when a beam of white light passes through a prism forming a spectrum on a screen, as shown in the diagram.
(i) What is meant by the terms dispersi... show full transcript
Worked Solution & Example Answer:Dispersion occurs when a beam of white light passes through a prism forming a spectrum on a screen, as shown in the diagram - Leaving Cert Physics - Question 8 - 2007
Step 1
What is meant by the terms dispersion and spectrum?
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Answer
Dispersion refers to the process of breaking up white light into its constituent colors. This occurs when light passes through a prism, which causes the different wavelengths of light to spread out. A spectrum is defined as the range of colors or wavelengths present in the light source, which can be observed as a rainbow effect when light refracts through the prism.
Step 2
What happens to the white light when it enters the prism at Z'?
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When white light enters the prism at Z', it changes direction due to refraction. This process slows down and disperses the light, resulting in the separation of colors that make up the white light.
Step 3
Name the invisible radiation formed on the screen at (i) region X, (ii) region Y.
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Region X corresponds to infrared radiation, while region Y corresponds to ultraviolet radiation.
Step 4
Describe how to detect one of these invisible radiations.
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Infrared radiation can be detected using an infrared thermometer, which senses temperature variations. Ultraviolet radiation can be detected using fluorescent materials that emit visible light when exposed to UV radiation.
Step 5
Give a use for one of these invisible radiations.
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Infrared radiation is commonly used in remote controls for televisions and other devices, allowing users to operate them from a distance.
Step 6
Name the primary colours.
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The primary colours are red, green, and blue.
Step 7
How is a secondary colour (e.g. yellow) produced on a TV screen?
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A secondary colour, such as yellow, is produced by mixing the primary colours red and green on a TV screen. The combination of these two colours results in the perception of yellow.
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