Optics Review 1. Match the vocabulary words from Column 1 with the choices in Column 2. Column 1 Vocabulary Words Column 2 Choices 1. incandescence A. production of light by friction 2. chemiluminescence B. production of light by heat 3. phosphorescence C. production of light by plants and animals 4. bioluminescence D. immediate production of light resulting from the absorption of UV light 5. fluorescence E. prolonged production of light resulting from the absorption of UV light F. production of light by a chemical reaction 2. List the different types of Light/EM Radiation in order of increasing wavelength. 3. Which type of material absorbs most light and transmits little light? a) translucent b) transparent c) opaque d) reflective 4. Refer to the diagram to the right. Assume angle A measures 55 o. a) What is the measure of the angle of incidence? _ b) What is the measure of the angle of reflection? _ c) What is the measure of angle D? _ 5. True or False (correct if false): The image size of an object in a plane mirror will change as you move further away from the mirror. 6. In the line provided, state whether the item uses a concave (V) or convex (X) mirror. (2) a) Side view mirrors on cars b) Satellite c) Make up mirror d) Security mirrors e) Parking garage 7. True or False (correct if false): Convex mirrors always produce images that are smaller and real. 8. True or False (correct if false): Refraction will always occur when light travels from one medium into another. 1
9. In a concave mirror the distance from C to V is 30 cm. Where must an object be located in order for the following (provide numbers): a) No image is created b) Real image is at C c) Real image that is smaller than object d) Real image that is large than object e) Virtual image 10. If the distance from the vertex of a concave mirror to C is 10 cm, what is the focal length? Sketch the mirror, C, F and f. 11. As light crosses the interface between air and water it: a) speeds up and bends toward the normal b) slows down and bends toward the normal c) speeds up and bends away from the normal d) slows down and bends away from the normal 12. In each diagram below, draw in the normal line and measure the angles of incidence and refraction. 13. If light travels at 1.50 x 10 8 m/s in a certain medium, what is the medium s index of refraction? a) 0.50 b) 1.50 c) 2.00 d) 4.50 14. The index of refraction of a plastic is 1.45. The speed of light in this plastic is a) 2.1 10 8 m/s c) 0.48 108 m/s b) 4.6 108 m/s d) 3.0 108 m/s 15. Complete the sentence: When the angle of _ equals the critical angle the angle of will equal 90 o. 16. Complete the sentence. Individuals who have difficulty seeing distant objects but can see nearby objects suffer from _, also called near-sightedness. This condition can be corrected with a lens or a meniscus. 17. The image of an object in a concave lens is always a) real and small b) real and large c) virtual and small d) virtual and large 2
18. Use Snell s law to determine the angle of refraction. Then draw in the refracted rays in each example. 19. Use proper scientific terminology to describe what is happening in this diagram. 20. Explain why the fish appears higher to the observer than it actually is. 21. Use the terms refraction, critical angle and total internal reflection to explain how this prism based periscope works. 3
22. Refer to the diagram below. Name the structure and function of #3, 6, 7, & 8. 23. Locate the image produced by this mirror AND show how the eye will see the entire image. 24. Locate the image and describe the image using SALT. 25. Locate the image and state the image characteristics using SALT. 4
26. Locate the image and describe the image by referring to SALT. 27. Locate the image and state the image characteristics using SALT. 28. A 12.0 cm object is 24.0 cm in front of a diverging lens with a focal length of 12.0 cm. Draw a scale diagram, locate the image and describe the image properties. State your scale. S: A: L: T: Calculate the following di and hi. What is the magnification of the image? 5
b. An incident ray in air (n=1.0) is approaching the 29. A converging lens has a focal length of 15 cm. An object 5 cm tall boundary is placed with 20 glass cm. (n Apply = 1.52) at an angle of incidence of 32.5. Calculate the angle of refract calculations to determine image distance and height and describe Draw the the image refracted characteristics ray on the diagram at the rig using SALT. 2. For the following two situations, measure and recor with the calculated angle of refraction. PSYW 30. Refer to the diagram below. a) Explain why TIR is possible. b) Calculate the critical angle for the Crown Glass-Water boundary. The Physics Classroom, 2009 c) Measure the angle of incidence and draw the appropriate ray. Hint: Think about whether TIR will or will not occur. 31. Light travels from air to glass to water. As light travels from air to glass, it strikes the glass at an angle of 28 o. a) Calculate the angle of refractions as light passes through glass and then into water. b) Use these values to draw the path light will take as it passes from air to glass to water. 6
32. Light passes from air into another material. The angle of incidence is 25 o and the angle of refraction is 19 o. Calculate the index of refraction of the second medium. What substance is the second medium likely made up of? 33. A real image is magnified by 2 when the object is placed 22 cm in front of a lens. Determine the image distance and the focal length of the lens. 34. Determine the focal length of a diverging lens that produces an image that is 12.9 cm from the lens when the object is 32.4 cm from the lens. 35. An actor is applying make-up using a concave mirror. The actor s face is 35 cm in front of the mirror. The upright image is 65 cm behind the mirror. Use this information to determine the focal length of the mirror. 7