Optics Practice Date: 07/01/2010 Version #: 0 Name:
1. Which of the following diagrams show a real image? a) b) c) d) e) i, ii, iii, and iv i and ii i and iv ii and iv ii, iii and iv 2. A real image is an: a) image that can be cast onto a screen b) image that is made up of rays that only "seem" to come from the image location c) image that is seen in plane mirrors d) image that is always upright 3. Which of the ray diagrams is correct? a) b) c) d) e) none of these are correct
4. In all four diagrams, the object is 5 cm high. Which set ups will produce a real, inverted image that is greater than or equal to 5 cm in height. a) b) c) d) e) Diagram i Diagram ii Diagram iii Diagram iv Diagrams ii and iv 5. The image formed when an object is placed outside the focus of a concave lens is a) virtual and inverted b) virtual and upright c) no image will be formed d) real and upright e) real and inverted 6. The image formed when an object is placed outside the focus of a convex lens is a) real and inverted b) real and upright c) virtual and inverted d) virtual and upright e) no image will be formed 7. The image formed when an object is placed inside the focus of a concave lens is a) virtual and smaller b) virtual and larger c) no image will be formed d) real and smaller e) real and larger 8. When light rays diverge as they pass through a lens, you know that the lens is a) convex b) concave c) straight d) really a mirror 9. An object is located 10 cm from a converging lens of focal length 12 cm. The image distance is a) 5.5 cm b) 5.5 cm c) 60 cm d) 60 cm 10. A pencil 10 cm long is placed 70 cm in front of a convex lens of focal length 50 cm. The image is a) 4 cm long and upright b) 4 cm long and inverted c) 25 cm long and upright d) 25 cm long and inverted
11. Flat mirror images are... a) smaller than the object. b) inverted left for right. c) upside down. d) upside down and reversed left for right. 12. A pencil 10 cm long is placed 30 cm in front of a mirror of focal length 50 cm. The image is a) 2.5 cm long and upright b) 0.25 cm long and inverted c) 25 cm long and upright d) 25 cm long and inverted 13. If you stand 5 m in front of a flat mirror, how far behind the mirror does your image appear to be? a) 0 m. b) 2.5 m. c) 5 m. d) 10 m. 14. Parabolic mirrors are often used in a) department store dressing rooms b) some camera lenses and telescopes c) eyeglasses d) all of the above 15. In the diagram, what is the normal to the mirror? a) line a b) line b c) line c d) angle q e) there is no normal in the diagram. 16. All of the diagrams have at least one missing light ray that has not been drawn in. Which diagram(s) correctly show(s) the image(s) that would form? a) b) c) d) 17. If an object is located inside the focus of a concave mirror, the image that is formed will be than the object. a) real and smaller b) real and larger c) virtual and larger d) virtual and smaller
18. If an object is located outside the center of curvature of a concave mirror, the image that is formed will be than the object. a) real and smaller b) real and larger c) virtual and larger d) virtual and smaller 19. If an object is located between the focus and the center of curvature of a concave mirror, the image that is formed will be than the object. a) real and smaller b) real and larger c) virtual and larger d) virtual and smaller 20. If an object is placed in front of a convex mirror, the image that is formed will be than the object. a) real and smaller b) real and larger c) virtual and larger d) virtual and smaller 21. A pencil 10 cm long is placed 100 cm in front of a mirror of focal length 50 cm. The image is a) 3 cm long and upright b) 3 cm long and inverted c) 10 cm long and upright d) 10 cm long and inverted 22. The focal length of a spherical concave mirror is a) equal to the radius of curvature of the mirror b) two times the length of the principle axis c) half the distance between the center of curvature and the mirror's surface d) equal to twice the radius of the mirror 23. What is the perfect shape for a concave mirror that must reflect parallel rays of light to one point? a) Circle b) Oval c) Parabola d) Right angle e) Cylinder 24. What is the magnification of a convex lens which produces a 5 cm high image from a 1cm tall object when the object distance is 10 cm? a) 5 times b) 0.2 times c) 50 times d) 2 times 25. An object 1.0 cm high is placed 12 cm from a convex lens which has a focal length of 10 cm. What is the distance of the image from the lens? a) 60 cm b) 12 cm c) 0.017 cm d) 1.2 cm 26. Complete the ray diagram below, identifying the location and height of the image. Marks will be assigned for accuracy!
27. Complete the ray diagram below, identifying the location and height of the image. Marks will be assigned for accuracy! 28. Using the measurements from your ray diagram in the previous question, calculate... a) the magnification of the image (2 marks) b) the location of the image (2 marks) 29. Complete the ray diagram below, identifying the location and height of the image. Marks will be assigned for accuracy! 30. Complete the ray diagram below, identifying the location and type of image. 31. Complete the ray diagram for the mirror shown below, identifying the location and height of the image. Note that the object is placed beyond the center of curvature for the mirror. Marks will be assigned for accuracy!
32. Find the image position by drawing lines and completing the following sketch. Circle the location of the image. (2.00 marks) 33. Explain, by means of a diagram plus an explanation, how images form in a plain mirror. 34. Show the location of all images formed by the mirrors below. Draw at least one light ray for each image that shows the path of light to the eye. (3.00 marks)