Halos are caused by hexagonal ice crystals in the upper atmosphere.
a. True
b. False
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[Ques. 2] A converging lens always forms an object's image at the focal point of the lens.
a. True
b. False
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[Ques. 3] An image seen projected on a screen by a single lens is always inverted.
a. True
b. False
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[Ques. 4] In the atmosphere, the intensity of scattered sunlight of longer wavelength is greater than that of shorter wavelength.
a. True
b. False
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[Ques. 5] A diverging lens is thicker at the center than the edges.
a. True
b. False
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[Ques. 6] A person looking through eyeglasses sees real images.
a. True
b. False
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[Ques. 7] A convex mirror will allow you to see large areas normally hidden from your view.
a. True
b. False
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[Ques. 8] The Hubble Space Telescope has been repaired.
a. True
b. False
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[Ques. 9] Diverging lenses have negative focal lengths.
a. True
b. False
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[Ques. 10] The ideal shape for the primary mirror of a telescope is concave parabolic.
a. True
b. False
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