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SNC 2D Optics Review Key Terms – Define the following terms. Angle of incidence Focal length Virtual image Angle of reflection Focal point Pinhole camera Angle of refraction Image Plain mirror Critical angle Luminous Principal axis Center of curvature Incident ray Rectilinear propagation Chemiluminescene Index of Refraction Reflected ray Concave Law of Reflection Refraction Converge Real image LOST Converging lens Medium Speed of light Convex Diffuse reflection Regular reflection Optical Density Normal Total internal refraction Diverge Object Non-luminous Diverging lens Wavelength Vertex Electromagnetic spectrum Virtual image 1. Give two examples of luminous and non-luminous objects. 2. What is the law of reflection? 3. What is the difference between specular and diffuse reflection? 4. How does the object distance compare to image distance in a plane mirror? 5. Complete a ray diagram showing the image’s object and the path that the important rays of light take to reach your eye. eye • 6. How can you find the focal point of a concave mirror? 7. Use a ray diagram to show the image characteristics for a concave mirror when: (a) an object is placed outside 2F. (d) an object is placed on F. (b) an object is placed at 2F (e) an object is placed inside F. (c) an object is placed between F and 2F. 8. Use a ray diagram to show the image characteristic for a convex (diverging) mirror when an object is placed between F and 2F 9. The index of refraction of diamond is 2.54. Explain what this tells us about the speed of light as is travels through diamond. 10. The index of refraction of water is 1.33. Determine the speed of light in water. 11. Light travels at 1.24 x 108 m/s through a substance. What is the index of refraction, and what is the substance? 12. Use the mirror equation and magnification equation to determine the height of the image given the following. (a) An object that is +3 m tall placed +5 m in front of a concave mirror with a focal length of +3 m. (b) An object that is +3 m tall placed +5 m in front of a convex mirror with a focal length of -3 m. 13. What does it mean when di is a negative number when dealing with mirrors? 14. What is total internal reflection? Use a diagram to explain. 15. Which medium has a greater index of refraction in the following situations? In each case medium 1 is on top, medium 2 is on the bottom. The normal is shown. 16. Medium B has the highest index of refraction, medium A the second highest, and medium C the lowest. Draw a ray of light as it travels from medium A to B to C. A B C 17. At which angle(s) of incidence will no refraction occur? 18. What happens to the brightness of the reflected and refracted rays as the angle of incidence increases from 0º 19. 20. Use a ray diagram to show the image characteristics for a converging lens when: (a) an object is placed outside 2F. (d) an object is placed on F. (b) an object is placed at 2F (e) an object is placed inside F. (c) an object is placed between F and 2F. Determine the distance and height of an image that of a +5 cm tall object placed +10 cm from a converging lens. The focal length of the lens is 6 cm. 21. Determine the image height and magnification of a 7.8 cm tall object placed 12.0 cm away from a converging lens with a focal length of 20.0 cm. Is the image real or virtual? 22. What does it mean when di is negative when dealing with converging lenses? 23. What does it mean when hi is negative when dealing with converging lenses?