Integrated Coordinated Science for the 21st Century
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Answers
For You To Do
- Be sure the front and back of the acrylic block are parallel.
- The students do not need to mark the path of the beam inside the acrylic block. They find the angles inside by connecting the points where the light enters and leaves.
- The students do not need to mark the path of the beam inside the acrylic block. They find the angles inside by connecting the points where the light enters and leaves.
- The students can measure every ten or fifteen degrees.
- Remind the students to look straight down when marking the path of the beam to avoid parallax.
- a) Remember that angles are measured from the normal.
b) Each ratio is >1 since <i ><R
c) This ratio is (approximately) a constant.
- Be sure the side of the acrylic block is perpendicular to the front.
- a) Note that as the critical angle is approached, the refracted intensity diminishes and the refused intensity grows.
b) If angle 2 is greater than the critical angle, the refracted ray disappears.
c) The incident ray (inside the acrylic block) is totally reflected, with an angle of reflection equal to angle 2.
- This is a model of a light. When the light hits the walls, there is total internal reflection.
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