| 1. | Smoke puffs from a stone chimney, and light beams down from heaven.
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| 2. | Its light beam could be seen from a distance of 15 miles.
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| 3. | This new-fangled method destroys a hair follicle with a laser light beam.
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| 4. | Since 1993, automatic garage doors have featured an invisible backup light beam.
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| 5. | At the common focal point superposition of both focused light beams occurs.
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| 6. | The light beam flashes at alternate intervals of 2.5 and 7.5 seconds.
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| 7. | The figures show two incident light beams ( A and B ).
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| 8. | The projector generates light beams which form the image on the screen.
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| 9. | Can a light beam reflect off the photons in another light beam?
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| 10. | Light beam exhibiting reflection, refraction, transmission and dispersion when encountering a prism
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