Section 1:

Name: The Electromagnetic Spectrum and Sources of Light Lab STATION #1: Dispersion Watch the following Youtube video: Dispersion of Light Through a Prism 1. When the white light enters the triangular prism, it separates (disperses) the light into the colours it is made from. In the diagram to the right, draw the ray of white light entering the prism and the rays of coloured light that appears. 2. List the colours in the order that you see them in the electromagnetic spectrum (and in the video). STATION #2: Ultraviolet Light 1. Insects such as honeybees and butterflies can see UV light. Check out the two videos that explain this in more detail: UV Plants Caught on Camera and how bees see flowers. Describe how the flowers appear under the UV light and how this would be an advantage to the plant and to the insect. 2. The rocks at this station contain minerals that are luminous under UV light. Describe their appearance: a. in normal daylight. b. under UV light.c. Specifically, what is this type of light called? STATION #3: Infra-red Light 1. If you carefully put your hand under an infrared light bulb for just a few seconds, predict what you might feel. 2. What is infra-red light commonly known as? What is one common application of infrared light. STATION #4 - Plasma Ball 1. What is plasma and how does a plasma ball work? Here is a great website that explains how a plasma ball works. Here is a video that explains how a plasma ball works. STATION #5 - Sources of Light Research There are many ways that light can be produced by objects. Choose a specific object that is luminous and do some research to respond to the following questions. 1. What luminous object did you choose? 2. What specific way is light being produced by that object? (Nuclear Reactions, Incandences or Luminesence- Be specific) 3. How is light being produced by that object? 4. Describe a specific use or application of this type of light. 5. Evaluate how this type of light benefits society.SNC2DI Optics Quiz 2 Part A: CIRCLE OR HIGHLIGHT the correct answer. 1. The SALT acronym is used to describe images produced by optical devices such as mirrors and lenses. What does the A stand for and describe? a. Attitude; is the image upside down (inverted) or right side up. b. Absorption; how much light is absorbed. c. Type; is the image smaller or larger. d. Light; How much light hits the mirror. 2. Which of the following is one of the laws of reflection? a. The angle of incidence is never equal to the angle of reflection. The incident ray, the reflected, and the normal all rest in different planes. c. The angle of reflection is always equal to the angle of incidence. d. cident ray and the reflected ray are always on the same side of the normal. 3. Which statement about mirrors is incorrect: a. Mirrors can be flat or curved b. Mirrors can reflect light C. Mirrors can refract light d. Mirrors are usually made out of glass with a silver layer on the back. Use the following image to answer the next three questions: 4. Which letter on the image above represents the principal focus/focal point? a. b. C. D 5. Which letter on the image above represents the vertex? a. A b. C. 6. Which letter on the image above represents the focal length? a. A b. C. d 7. What do we call the phenomenon of light bending when traveling through different substances? a. Reflection b. Absorption C. Transparent d. Refraction8. The refractive index is... a. A physical property of a substance. b. Used to describe how light is reflected. c. Is the same for every substance. d. A chemical property of a substance. 9. The laws of refraction state that... a. Light slows down when it goes from an object with a low refractive index to an object with a high refractive index. b. Light speeds up when it goes from an object with a high refractive index to an object with a low refractive index. c. When light travels through 2 substances along the normal, it will not change direction but will change speed d. All of the above. 10. Which statement is true about lenses? a. A lens must always have two curves. A lens is a piece of transparent material with at least one smoothly curved surface. C. A lens is a piece of opaque material with at least one smoothly curved surface Lenses reflect light. Part B: CIRCLE OR HIGHLIGHT the correct answer. 1. Optical devices use mirrors, lenses, prisms, or a combination of the three to produce images. a) True b) False 2. The object distance is always longer than the image distance in a plane mirror. a) True b) False 3. The T in the SALT acronym stands for Type and describes if the image is real or virtual. a) True b) False 4. Absorption, reflection, and transmission are the three ways that light can behave when it comes in contact with an object. a) True b) False 5. Converging lenses cause light rays to spread apart. a) True b) False Part C: Matching Questions (3 marks) 1. Match the letter of the description to the name of the type of material in the following table: (3 marks) Type of Material Description of how light interacts with it. Opaque A. Allows some light to pass through but some light is reflected/absorbed. Transparent B. Allows no light to pass through. All light is either reflected or absorbed. Translucent C. Allows all light to pass through. Part D: Short Answer Questions (16 marks) 1. Label the following parts on the plane mirror diagram below: Normal, Incident Ray, Point of Incidence & Angle of Reflection. (4 marks)2. Use either the angle method or the distance method to form the image in the plane mirror below. (4 marks) 3. Using the values for the Refractive Index of different substances in the chart. calculate the speed of light (v) in water. Show your work and include units for full marks. (3 marks) v= cm 4. Use the steps learned in class to draw the image produced by this diverging lens. State the SALT acronym for the image produced. (5 marks) Bonus: 1. Choose one optical device (that you know of or that was discussed in class) and explain how it produces an image. (maximum 2 bonus marks)