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Questions and Answers
Which property of light allows it to change direction when it hits a surface?
The frequency of light waves is inversely related to their wavelength.
True
What is the role of lenses in the eye?
To focus light onto the retina
Match the properties of light with their definitions:
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What occurs when light passes through a lens?
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Light waves can only be absorbed, never reflected.
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What are the three main properties of light?
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The part of the electromagnetic spectrum that is visible to the human eye is known as _____ light.
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Match the following colors with their wavelengths in the visible spectrum:
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Study Notes
Light Waves
- Light travels in waves.
- Wavelength is the distance between two crests or troughs of a wave.
- Period is the time it takes for one complete wave cycle.
- Frequency is the number of wave cycles that pass a point in a given time.
Properties of Light
- Reflection is the bouncing of light off a surface.
- Transmission is the passing of light through a material.
- Absorption is the process of light being taken in by a material.
Electromagnetic Spectrum
- The electromagnetic spectrum is a range of all types of electromagnetic radiation.
- Visible light is a small part of the electromagnetic spectrum.
- Visible light is the only part of the electromagnetic spectrum that humans can see.
Lenses and the Eye
- Lenses are transparent objects that can bend light.
- The human eye has a lens that focuses light onto the retina.
How We See Colour
- The colour of an object is determined by the wavelengths of light it reflects.
- White light contains all wavelengths of visible light.
- Different colours correspond to different wavelengths of light:
- Red (longest wavelength)
- Orange
- Yellow
- Green
- Blue
- Indigo
- Violet (shortest wavelength)
Light Waves
- Light is made up of electromagnetic waves
- Wavelength is the distance between two corresponding points, for example, two crests, on a wave
- Period is time for one wave to pass a specific point
- Frequency is the number of waves passing a specific point per second
Properties of Light
- Reflection is when light bounces off a surface
- Transmission is when light passes through a material
- Absorption is when light is taken in by a material
Refraction
- Refraction is the bending of light as it passes from one medium to another
- The amount of bending depends on the angle of incidence and the refractive indices of the two mediums
Electromagnetic Spectrum
- The electromagnetic spectrum is a range of all types of electromagnetic radiation, including visible light
- Visible light is part of the electromagnetic spectrum that humans can see
- Different wavelengths of visible light are perceived as different colours
Lenses and the Eye
- Lenses are transparent materials that refract light
- Converging lenses bring parallel rays of light together at a point called the focal point
- Diverging lenses spread out parallel rays of light
- The human eye uses a converging lens to focus light onto the retina
How We See Colour
- Objects absorb some wavelengths of light and reflect others
- The reflected wavelengths determine the colour we see
- For example, a red object absorbs all wavelengths except red which it reflects
- White objects reflect all wavelengths of visible light
- Black objects absorb all wavelengths of visible light
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Description
Explore the fascinating world of light waves, their properties, and how we perceive colors. This quiz covers topics such as the electromagnetic spectrum, reflection, transmission, and the role of lenses in the human eye. Test your knowledge on how light affects our vision and the color of objects.
