Integrated Coordinated Science for the 21st Century
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Answers
Physics To Go
- The light is bent toward the normal, so the angle of incidence is larger (except when the angle of incidence is zero).
- a) See drawing on page 231.
b) Yes.
- See drawing on page 231.
- See drawing in Background Information
- a) 90°
b) The angle of incidence equals 90°. The angle of refraction equals 42°, the critical angle
- a) The critical angle.
b) All the light is reflected inside the block.
c) See drawing on page 232. (Look at the incident ray inside the acrylic block.) With a slightly larger value for angle 2, the refracted ray in air will have an angle of refraction
of 90°.
- a) See drawing on page 231.
b) These rays are parallel.
c) By alternate interior angles, inside the gelatin the angle of refraction is equal to the angle of incidence at the rear of the block. Since the light paths can be reversed, the angle of refraction in the air equals the angle of incidence in the air. (It may help to rotate the diagram at the back side of the block by 180° and compare it with the diagram at the front.)
- The amount of refraction depends on the wavelength. Equivalently, the angle of incidences is a function of the wavelength.
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