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Propagation of Light Practice Questions

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Updated on Sep 27, 2011

Review these concepts at: Propagation of Light Study Guide

Practice Questions

  1. Consider the arrangement of a solar eclipse, and using the ray approximation, draw at least three rays that will show how a solar eclipse happens.
  2. Propagation of Light

    You can use as a starting point the planetary arrangement shown in Figure 19.4 (drawing not at scale).

    Propagation of Light

  3. Consider the arrangement of a lunar eclipse, and using the ray approximation, draw at least three rays that will show how a lunar eclipse happens. You can use as a starting point the planetary arrangement shown in Figure 19.5 (drawing not at scale).
  4. Propagation of Light

  5. An object is placed in front of a system of two mirrors, as shown in Figure 19.6. Find the number of images and show the first few images' formation.
  6. Propagation of Light

  7. Consider a person 1.64 m tall from the ground to the level of his or her eyes. The person stands in front of a mirror and the mirror is 0.84 m high, starting from the ground up. Can the person see his or her toes by looking in the mirror? Draw the diagram.
  8. An object is placed in front of a mirror and an image is obtained with a di equal to 20 cm. The object is displaced from its initial position to a point 30 cm in front of the mirror. What is the distance between the image and the mirror after displacement? What is the distance to the mirror of the object in the first case?
  9. An object 3 cm high is placed in front of a concave mirror at a distance of 9 cm, and the radius of the mirror is 12 cm. Find the characteristics of the image obtained in the mirror and draw the image (see Figure 19.11).
  10. Propagation of Light

  11. An object 3 cm high is placed in front of a concave mirror at a distance of IS cm, and the radius of the mirror is 12 cm. Find the characteristics of the image obtained in the mirror.
  12. A convex mirror of focal length 10 cm has an object placed in front of it at a distance of 30 cm. The object is upright and with a height of 10 cm. Find the characteristics of the image.
  13. Using the previous example, find the characteristics of an image if the object is placed in front of a divergent lens beyond its focal point at a distance of 30 cm and the focal distance is 10 cm.
  14. A plano-convex lens has a radius of 20 cm. What is the other radius of the lens?
  15. If a flint glass lens with an index of refraction of 1.66 has equal radii and a focal distance of 20 cm, find the radius of the curvature.
  16. An incident fascicle of rays propagates toward a convergent lens, as in Figure 19.17. Continue the ray diagram beyond the lens.
  17. An incident fascicle of rays propagates toward a divergent lens, as in Figure 19.18. Continue the ray diagram beyond the lens.
  18.  

    Propagation of Light

    Propagation of Light

Answers

  1. The light rays will go in straight lines from the sun toward the moon-Earth system and from the shadow of the moon on the earth (umbra) and the penumbra.
  2. Propagation of Light

  3. The same procedure as in the example below will be employed in this case.
  4. Propagation of Light

  5. The number and position of the images is found by applying the laws of reflection to the parallel mirrors: Each image is an object for the next mirror. There will be an infinite number of images formed in the system of two parallel mirrors.
  6. Propagation of Light

  7. Yes
  8. Propagation of Light

  9. di = 30 cm, do = 20 cm
  10. di = 18 cm, m = –2, hi = –6 cm, image is real, inversed, and larger than the object
  11. Propagation of Light

  12. di = 10 cm, m = –2/3, hi = –2 cm, image is real, inversed, and smaller than the object
  13. Propagation of Light

  14. di = –7.5 cm, m = 0.25, hi = 2.5 cm, image is virtual, straight, and smaller than the object
  15. Propagation of Light

  16. di = – 7.5 cm, m = 0.25, hi < ho, the image is virtual, smaller than the object, and upright
  17. The other radius is infinity because the plane will be part of a huge sphere of radius infinity.
  18. R = 26.4 cm
  19. All rays will bend toward the focal point and will pass through the focal point.
  20. Propagation of Light

  21. The light is spread by the lens, and the back extension of the light will pass through the focal point.
  22. Propagation of Light

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