The Refraction of Light Name :

Date :

Total out of /24 % Pattern :

Part I – Using a Ray Box

  1. Trace the shape of the Double Convex Lens (lenses allow light to pass through)and the Plano-Convex Lens in the space provided below. One at a time, shine the ray box (with 5 slits) straight at the center of the Convex Lenses and trace the path the rays take. Be sure to include arrows indicating which are rays of incidence, and which are rays of refraction. What difference do you notice between the two? Why do you think that is?
  1. Trace the shape of the Double Concave Lens(lenses allow light to pass through) and the Plano-Concave lens in the space provided below. One at a time, shine the ray box (with 5 slits) straight at the center of the Concave Lenses and trace the path the rays take. Be sure to include arrows indicating which are rays of incidence, and which are rays of reflection. What difference do you notice between the two? Why do you think that is?

Part II – Answering the Questions

Use your Science Focus 8 Textbook pages 200 to 205 help you answer the following questions:

  1. In one word, describe what refraction is in terms of what is does to light…

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  1. Give a definition as to what “refraction means” and in one sentence, explain why refraction occurs.
  1. Draw and label a diagram that depicts a ray of light traveling through air and then hitting a flat surface of water at a 45˚ angle. Please use a “fat” ray of light in your diagram and show where the normal line, angle of incidence, and angle of refraction are. Be sure to label which medium is more dense, which “corner” of the ray strikes the water first and what happens to the speed of both corners of the ray of light once the first one strikes the water.
  1. a) What is the one property of matter that will change how much a ray of light will slow down when it strikes it… this property also affects how much the light will be bent.

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b) As the density of the medium increases, how will that affect the angle of refraction?

  1. Below are three different liquids each of which is transparent but each also has a different density. Based on the angle that the beam of light is striking the surface of the water, draw how the light would bend as it passes from the air, into the different liquids comparatively (use the normal lines provided).

Hand Gell (most dense) Nitro Liquid (middle dense) Bleach (least dense)

  1. a) As the angle of incidence decreases, what will happen to the angle of refraction?

b)What will the angle of refraction be if the angle of incidence is zero?

c) Complete the diagram below by completing each of the rays of light and how they would refract after striking the water the water.

d) In the diagram you just completed above, what do you notice about the angles of refraction, as the angles of incidence are increasing?

e) Below are three different jars of water. Each jar of water has a pencil being propped up in it. What will the bottom half of the pencil look like based on the angle that it is propped up in the jar. Finish each of the drawings. (Feel free to try this experiment out yourself)

7. Draw a diagram of a grizzly bear as it is looking at a fish (potential dinner) in a lake. Use a solid line to show the actual path the ray of light takes as it is reflected from the fish, to the bear’s eye. Use a dashed line that continues along into the water where the fish would “appear” to be if the light were not refracted by the water.

8. On slide 23 is the “BIG IDEA” for the lesson. Please copy out the info this slide and two main points that we have been discussing in this lesson.