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What I Know Instruction: Write the letter of the correct answer on a separate sheet of paper. 1. Which of the following best describes the image formed by a plane mirror? A. real, inverted and reduced B. virtual, inverted and enlarged C. real, upright and the same size as object D. virtual, upright and the same size as object 2. What is the object distance from the mirror if a virtual image is formed 10.0 em along the principal axis from a convex mirror of focal length -15.0 cm? A. 3.0 cm B. 6.0 cm C. 10.0 cm D. 30.0 em 3. What is the mirror's focal length if a man's face is 30.0 cm in front of a concave shaving mirror creating an upright image 1.50 times as large as the object? A. 12.0 cm B. 20.0 cm C. 70.0 cm D. 90.0 cm 4. Which of the following best describes the image formed by a concave mirror when the object is located somewhere between the focal point (F) and the centre of curvature (C) of the mirror? A. virtual, upright and reduced C. real, inverted and reduced B. virtual, upright and enlarged D. real, inverted and enlarged 5. Which of the following best describes the image formed by a concave mirror when the object is at a distance further than the centre of curvature (C) of the mirror? A. virtual, erect and enlarged C. real, inverted and reduced B. virtual, upright and reduced D. real, inverted and enlarged 6. Which of the following best describes the image formed by a convex mirror when the object distance from the mirror is less than the absolute value of the focal length (f)? A. virtual, upright and reduced C. real, inverted and reduced B. virtual, upright and enlarged D. real, inverted and enlarged 7. A man wishes to use a plane mirror on a wall to view both his head and his feet as he stands in front of the mirror. What is the required length of the mirror? A. equal to the height of the man B. equal to one half the height of the man C. depends on the distance the man stands from the mirror D. depends on both the height of the man and the distance from the man to the mirror 8. What is the image of an object when seen in a convex mirror? The image is always or either be A. magnified or virtual C. real or virtual B. magnified or real D. none of the above 9. A carbon tetrachloride has an index of refraction of 1.461. What is the speed of light through this liquid? (c = 3 x 108 m/s) A. 1.461 x 10 m/s C. 4.38 x 105 m/s B. 2.05 x 109 m/s D. 4.461 x 105 m/s 10. A 3.0 cm tall object is placed along the principal axis of a thin converging lens of 30.0 cm focal length. Which of the following best describes the image distance and height, respectively if the object's distance is 40.0 cm? A. 17.3 cm; 1.0 em C. 120 cm; -1.0 emB. 17.3 cm; 7.3 cm D. 120 cm; -9.0 cm 1 1. Which of the following best describes the image for a thin converging lens that forms whenever the object is at a distance less than one focal length from the lens? A. inverted, reduced and real C. upright, reduced and virtual B. inverted, enlarged and real D. upright, enlarged and virtual 12. An object is placed at a distance of 30.0 cm from a thin converging lens along its axis. The lens has a focal length of 10.0 cm. What are the values of the image distance and magnification respectively? The image distance is while the magnification is A. 15.0 cm; -0.500 C. 60.0 cm; -0.500 B. 15.0 cm; 2.00 D. 60.0 em; 2.00 13. An object is placed at a distance of 30.0 cm from a thin converging lens along the axis. What is the focal length of the lens if a real image forms at a distance of 10.0 cm from the lens? A. 7.50 cm B. 10.0 cm C. 15.0 cm D. 30.0 cm 14. What do you call the eye condition in which the image is formed behind the retina? A. image defect C. farsightedness B. blind spotting D. nearsightedness 15. How can nearsightedness be corrected? It can be corrected by using A. converging mirror C. diverging mirror B. converging glasses D. diverging glasses