quiz 9 D - Quiz 9, Physics 2C Name_ MULTIPLE CHOICE. Choose...

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Quiz 9, Physics 2C Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) An amateur astronomer grinds a convex-convex lens whose surfaces have radii of curvature of 40 cm and 60 cm. The glass has an index of refraction of 1.54. What is the focal length of this lens in air? A) 126 cm B) 88.8 cm C) 44.4 cm D) 222 cm E) 42.5 cm 1) 2) When an object is placed 30 cm from a converging lens, the image formed is positioned 60 cm from the lens. If the object is moved 5 cm closer to the lens, the position of the image changes by 40 cm. What is the focal length of the lens? A) 16 cm B) 32 cm C) 20 cm D) 25 cm E) 36 cm 2) 3) A lens of focal length 10.5 cm is used as a magnifier. The object being viewed is positioned at the focal point of the lens. The lens is moved closer to the object, so that the image is now 25 cm from the lens. The distance the lens has been moved, in cm, is closest to: A) 2.8 B) 2.2 C) 3.4
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quiz 9 D - Quiz 9, Physics 2C Name_ MULTIPLE CHOICE. Choose...

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