Gauge Directions: Read carefully each item. Write only the letter of the best answer. Use a separate sheet of paper for your answers. A. Multiple Choices Test (5 points) 1. Which of the following color has the longest wavelength? A. yellow B. red C. blue D. green 2. What will be the arrangement of electromagnetic waves if we will I arrange them according to decreasing energy? A. Gamma, radio, microwave B. X-ray, gamma, ultraviolet C. X-ray, light, radio D. Gamma, ultraviolet, X-ray 3. What do you call the bending of light rays as they pass obliquely from one medium to another medium? A. reflection B. refraction C. dispersion D. diffraction 4. What type of reflection does fiber optic technology rely upon? A. Regular reflection B. Diffuse reflection C. Retro reflection D. Total internal reflection 5. Which light bends most when white light passes through a prism? A. red B. blue C. green D. violetB. On the space provided before each number, write A if the first statement is true and the second statement is false; B if the first statement is false and the second statement is true; C if both statements are true; or D if both statements are false. (2 points each number) 1. The bouncing of a light ray from a surface is called reflection of light. Refraction of light happens whenever light strikes a mirror. 2 . The limiting of the planes where light waves propagate is the polarization of light. Polarized glasses counter the glare from metallic surfaces by not allowing light of a particular orientation to pass through. 3. Total internal reflection always happens whenever the light rays passes from a medium of optically less dense to a more optically dense medium. Total internal reflection will happen as the light ray goes from inside a diamond to the air outside, but not when the light ray goes from the air to the diamond. 4 . The critical angle for material C is 570. If an incident ray approaches the boundary between material C and the air at 590, the light ray will be bent back and total internal reflection happens. The critical angle for material C is 570. If an incident ray approaches the boundary between material C and the air at 590, the refracted ray will lie along the boundary between the material. 5. The result of dispersion is the use of fiber optics The result of total internal reflection is the formation of rainbow