Physics
You are doing an experiment on the refraction of light in your Physics laboratory. ABCD is a rectangular block. A ray of light is incident obliquely on the surface AB.
(a) Draw the path of the ray of light through the glass block and also show how it emerges from the block. [ The diagram should show the lateral displacement suffered by the ray.]
(b) Which two pairs of angles remain the same during the experiment?
(c) If the same experiment is performed first with red and then with blue light, which colour will suffer greater lateral displacement?
Refraction Plane Surfaces
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Answer
(a) Below diagram shows the lateral displacement of a ray of light when it passes through a parallel-sided glass slab:
(b)
- Angle of incidence = angle of emergence
- Angle of refraction at the first surface = Angle of incidence at the second surface.
(c) Blue, because lateral displacement increases with the deceases in wavelength of light.
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