UNIT SUMMARY: Electromagnetic Spectrum, Color, & Light Name: Date:
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1 UNIT SUMMARY: Electromagnetic Spectrum, Color, & Light Name: Date: Topics covered in the unit: 1. Electromagnetic Spectrum a. Order of classifications and respective wavelengths b. requency, wavelength, and speed c. Examples across the spectrum d. Visible spectrum: ROYGBIV 2. Color Vision a. Cones and rods b. Primary additive colors (RGB) c. Primary subtractive colors (CYM) 3. Mirrors a. Law of Reflection b. Locating images for plane, convex, and concave mirrors c. Real vs virtual, upright vs inverted, magnification 4. Lenses a. Law of Refraction b. Locating images for converging and diverging lenses c. The thin lens equation d. Real.vs. virtual, upright.vs. inverted, magnification Resources: 3 Handouts UNIT10 Powerpoint 2 Quizzes Mirror ray diagrams, Lens ray diagrams 2 Laboratories LAB10.1: Converging Lens, LAB10.2: Mirrors
2 Electromagnetic Spectrum: 1. List the classifications of waves across the electromagnetic spectrum in order of increasing frequency 2. ind the frequency of an electromagnetic wave with a wavelength of 650 nanometers (remember, the speed light is 3.0 x 10 8 m/sec and that speed is equal to the product of the frequency and the wavelength) 3. ind the wavelength of an electromagnetic wave with a frequency of 100 megahertz. 4. List the colors in the visible spectrum in order of increasing wavelength Color Vision: 1. Illustrate the primary additive colors and their respective overlaps below 2. Illustrate the primary subtractive colors and their respective overlaps below 3. Illustrate what you would see if you looked through your additive color illustration through a magenta filter
3 Lenses 1. Define/Explain Refraction: 2. The "three principal rays" which are used for visualizing the image location and size are: A ray from the top of the object proceeding parallel to the centerline perpendicular to the lens. Beyond the lens, it will pass through the principal focal point. or a diverging lens, it will proceed from the lens as if it emanated from the focal point on the near side of the lens. A ray through the principal focal point on the near side of the lens. It will proceed parallel to the centerline upon exit from the lens. The third ray is not really needed, since the first two locate the image A ray through the center of the lens, which will be undeflected. (Actually, it will be jogged downward on the near side of the lens and back up on the exit side of the lens, but the resulting slight offset is neglected for thin lenses.)
4 Mirrors 1. Define/Explain the Law of Reflection 2. Mirror ray tracing is similar to lens ray tracing in that rays parallel to the optic axis and through the focal point are used. A third useful ray is that through the center of curvature since it is normal to the mirror and retraces its path backward. 3. Describe the types of images possible for mirrors: Plane mirror Convex mirror Concave mirror, object closer to mirror than focal length Concave mirror, object farther from mirror than focal length
5 Concave Mirror - Consider the concave mirror illustrated below, where the arc represents the mirror surface and the cross represents the center of curvature: a. Sketch a ray diagram for an object placed three focal lengths in front of the concave mirror, as shown below. Then classify the image by circling the appropriate options. b. Sketch a ray diagram for an object placed ½ of a focal length in front of the concave mirror, as shown below. Then classify the image by circling the appropriate options.
6 Convex Lens - Consider the convex lens illustrated below. a. Suppose an object is located at a distance equal to 1.5 times the focal length in front of the lens, as shown below. Sketch the ray diagram for the lens and classify the image by circling the appropriate options. OBJECT b. Suppose an object is located at a distance equal to 0.5 times the focal length in front of the lens, as shown below. Sketch the ray diagram for the lens using the thin lens approximation and classify the image by circling the appropriate options. OBJECT
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