Unit: Optics
Year: 1996 Question#: 91
Question: Which phenomenon allows a lens to focus light?
(1 ) diffraction
(2 ) refraction
(3 ) interference
(4 ) polarization
What is this question really asking?
Explanation by: LJG
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Answer 1
1. diffraction
INCORRECT
Diffraction can separate light by wavelength, creating a spectrum.
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Answer 2 refraction
CORRECT
Refraction bends light. A curved glass surface can bend this light to form an image.
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3. interference
INCORRECT
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Answer 4
4. polarization
INCORRECT
Polarization eliminates one orientation of light, and has nothing to do with the focusing the light. return to top
What's this question really asking?
The question is asking which type of lens can focus light. return to top
