| Aim - Measurement of the
critical angle qc
of a perspex block. |
Instructions |
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- The angle qp of the ray
of light to the normal in the perspex block is 10o.
Turn on the protractor and measure the corresponding
angle qa .
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- Increase the angle qp in
5o steps and in each case measure the angle of refraction
qa
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- When the angle of refraction qa
gets large, the increase in angle is reduced to steps
of 1o
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- Note the angle in the perspex block at which the light is no longer refracted out of the
block. This is the critical angle qc for
the perspex.
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| Copyright Physics Support Materials 2000 |