A physics class is investigating the dispersion of white light using a lens, as shown in the diagram below.
The students observe the rays
Which one of the following correctly identifies the colour, red
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A physics class is investigating the dispersion of white light using a lens, as shown in the diagram below.
The students observe the rays
Which one of the following correctly identifies the colour, red
→ The shorter wavelengths of light (violet) experience a greater refraction so the light rays of
→ The longer wavelength light (red) experiences the least refraction and so will be rays
A student sets up an experiment involving a source of white light, a glass prism and a screen. The path of a single ray of white light when it travels through the prism and onto the screen is shown in Figure 14.
A spectrum of colours is observed by the student on the screen, which is positioned to the right of the prism.
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a. → The observed effect is dispersion.
→ As light enters the glass it slows down as it is entering a denser medium.
→ As the refractive index for different wavelengths of light differs, the angle at which individual wavelengths refract differs slightly.
→ This causes the white light to split up as each wavelength refracts differently through the glass resulting in a rainbow spectrum on the screen.
b. Point
Point
a. → The observed effect is dispersion.
→ As light enters the glass it slows down as it is entering a denser medium.
→ As the refractive index for different wavelengths of light differs, the angle at which individual wavelengths refract differs slightly.
→ This causes the white light to split up as each wavelength refracts at different angles through the glass resulting in a rainbow spectrum on the screen.
b. Point
Point
A Physics class is investigating the dispersion of white light using a triangular glass prism.
Which one of the following diagrams best shows the principle of dispersion?
→ Dispersion is a result of white light splitting into different colours when it is refracted.
→ Dispersion occurs during both changes in medium (i.e. from air into glass and from glass into air).
→ The shorter violet wavelengths of light experience a greater refraction than the longer wavelength red light.
A ray of green light from a light-emitting diode (LED) strikes the surface of a tank of water at an angle of 40.00° to the surface of the water, as shown in Figure 11. The ray arrives at the base of the tank at point
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a.
b.
a.
b.
What happens to white light when it hits a red surface? (2 marks)
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→ When white light hits a red surface, the shorter wavelengths of light are absorbed into the surface.
→ The longer red wavelengths of light are reflected off of the surface and into the eyes of the observer, hence the surface appears red.
→ When white light hits a red surface, the shorter wavelengths of light are absorbed into the surface.
→ The longer red wavelengths of light are reflected off of the surface and into the eyes of the observer, hence the surface appears red.