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High up in the atmosphere, there are ozone molecules, (three oxygen atoms) that absorb the dangerous rays (Most ultraviolet, all X-rays and gamma).

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A ray of green light travels through air and is refracted as it enters a glass prism shown in the figure. An unknown liquid is in contact with the right side of the prism. The light then follows the path shown. Which one of the following statements concerning this situation is true? Image9.gif The frequency of the light changes inside the prism. The index of refraction of the glass is smaller than that of air. The index of refraction of the unknown liquid is the same as that of the glass. The speed of light is larger in the liquid than in the glass. The refractive index of the liquid is the same as that of air.
Suppose that a pane of crown glass, with a refractive index of 1.52, is immersed in water, which has a refractive index of 1.33. A ray of light traveling in the water strikes the glass at 45° relative to the normal and travels through the pane. What angle, relative to the normal, will the ray of light subtend when it leaves the pane and reenters the water? 38° 54° 32° 45° No angle at all! The premise is wrong. The light will never enter the glass. It will be reflected when it strikes the glass surface.
Which of the following statements is true? You can choose more than 1. As light travels from vacuum (n = 1) into glass (n > 1), the wavelength of the light changes. As light travels from vacuum (n = 1) into glass (n > 1), the frequency of the light changes. As light travels from vacuum (n = 1) into glass (n > 1), the speed of the light changes. An image that is formed behind a mirror is always inverted. An image that is formed behind a mirror is always virtual.

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