Name: __________________ Optics Unit Review 1. Define and give an example of each of the following terms: a. Illuminated - _________________________________________________________ b. Luminous - ___________________________________________________________ c. Opaque - ____________________________________________________________ d. Transparent - _________________________________________________________ e. Translucent - _________________________________________________________ f. Point source - _________________________________________________________ g. Extended source - _____________________________________________________ h. Transmitted - ________________________________________________________ i. Absorbed - __________________________________________________________ j. Reflected - __________________________________________________________ k. Plane mirror - ________________________________________________________ l. Concave mirror - ______________________________________________________ m. Convex mirror - _______________________________________________________ n. Primary colour ________________________________________________________ o. Secondary colour - _____________________________________________________ p. Convex lens - _________________________________________________________ q. Concave lens - ________________________________________________________ r. Refraction - __________________________________________________________ s. Cone cells - __________________________________________________________ t. Rod cells - ___________________________________________________________ 2. Fill in the following blanks about the production of light. a. Fire flies light up due to . b. An Easy Bake Oven uses ________________ light bulbs because they produce a lot of heat. c. Neon signs light up from _____________________________________. d. Glow sticks produce light from ____________________________________. e. Laundry detergent uses the light from _________________ to make you clothes look bright. f. Glow in the dark objects absorb light and release it slowly. This is called __________________. g. ___________________________ produces light from sugar crystals breaking and rubbing. h. The most energy efficient lights are ___________ lights. i. A _________________ only produces one type of energy wave. j. Humans can only see ____________________ light. We cannot see ultraviolet or infrared light. 3. What are the two parts of a shadow? ________________ and _____________________ 4. What type of shadow does: a. a point source produce? _______________________________________________ b. an extended source produce? ____________________________________________ 5. Draw a Solar Eclipse: 6. How is a solar eclipse different from a lunar eclipse? ___________________________________ __________________________________________________________________________________ 7. Label the Mirror, Incident Ray, Reflected Ray, Angle of Incidence and Angle of Reflection. Draw and label the Normal. Use your protractor to find the Angle of Incidence and Angle of Reflection. 8. What is the Law of Reflection? ________________________________________________ 9. What does “SALT” stand for? S _________ A___________ L__________ T__________ 10. What is the “SALT” for images in a plane mirror? S ______________ A _____________ L _____________ T ____________ 11. Sketch and name the two different types of curved mirrors. 12. Fill in the SALT table for Concave and Convex Mirrors below. CONCAVE Mirror S A L T S A L T Farther than C At C Between C and F At F Between F and V CONVEX Mirror 13. When light rays hit a concave mirror they (converge, diverge) and meet at a focal point. 14. When light rays hit a convex mirror they (converge, diverge) and spread out. 15. Complete the diagram to find the image in the concave mirror. Complete the SALT. S= A= L= T= 16. Complete the diagram to find the image in the concave mirror. Complete the SALT. S= A= L= T= 17. Compare the “SALT” for the diagrams above. Why are they different? Fill in the following blanks. 18. As light travels from a less dense to a more dense medium the light bends __________ the normal. 19. Light does not bend when it travels in a _____________ line. 20. Light travels at different speeds through different mediums because they are different ___________. 21. Light bends when it passes at an _________ through different mediums. 22. All the primary colours of light shine together to produce __________ light. 23. If all light is absorbed by an object, it appears _______________. 24. Red and green light mix to produce ______________ light. 25. Blue and yellow are __________________ colours. 26. A convex lens is _____________ at the centre than the edges. 27. Concave lenses ______________ objects, or make them smaller. 28. You are looking at a green fern (plant). Explain why the plant appears green in terms of colours of light that are absorbed and colours that are reflected. 29. Which colours combine to produce each secondary colour? Label the diagram of the human eye. 30. Write the three laws of refraction. a. Red Rule: __________________________________________________________________ b. Green Rule: _________________________________________________________________ c. Blue Rule: ____________________________________________________________________ 31. Draw the two types of lenses below. Which is a converging lens? Which is a diverging lens? Show how parallel light rays will refract differently as they pass through the lens. Convex Lens Concave Lens 32. Complete the diagram to find the image in the convex lens. Label F, F’, 2F, C, normal _________________________________________________ S= A= L= T= 33. Complete the diagram to find the image in the convex lens. _________________________________________________ S= A= L= T= 34. Complete the diagrams to show how light would refract. Air Air _____________________ Water _______________________ Water 35. Explain what is happening when a person is nearsighted versus farsighted. What is the problem? What type of lens would you use in this person’s glasses to correct their vision? Nearsighted: __________________________________________________ Lens? ________________ Farsighted: __________________________________________________ __Lens? ________________ 36. Where must the sun be for you to see a rainbow? ______________________________________ 37. Match the following: Eclipse Refraction Solar Oven Convex Visible Light Reflection LED Cornea Fiber Optics Virtual Image Heat Optic Nerve Medium Inverted Electric Discharge Prism ___________________Can only be seen in the mirror, not captured on a screen ___________________A small portion of the electromagnetic spectrum ___________________ Cheap to cook with because they do not require fuel ___________________ Incandescent light wastes a lot of energy making this ___________________Energy excites gases which glow and produce light ___________________ The material that light travels through, including air and glass ___________________ The moon blocks the light from the sun ___________________Have replaced most copper in transmitting information around the world ___________________ The top of an image now appears to be upside down ___________________Used as Christmas lights ___________________The bending of light as it slows down or speeds up ___________________ A lens that is thicker in the centre than the edges ___________________ Sends messages from the eye to the brain ___________________The first part of the eye the light reaches ___________________Shiny materials are able to do this ___________________ Can be used to separate white light into its many colours 38. Complete the diagram by filling in the primary colours, secondary colours and white light.
