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Questions and Answers
Which one of these is the focal length of a lens with a 2D capacity?
Which one of these is the focal length of a lens with a 2D capacity?
- 30 cm
- 50 cm
- 40 cm (correct)
- 20 cm
If the focal length of an upright lens is 50 cm, what is its power?
If the focal length of an upright lens is 50 cm, what is its power?
- +2D
- -5D
- -2D
- +5D (correct)
What is the focal length of a lens with a power of -2D?
What is the focal length of a lens with a power of -2D?
- 40 cm
- 30 cm (correct)
- 20 cm
- 50 cm
Which one of these is NOT a characteristic of light rays?
Which one of these is NOT a characteristic of light rays?
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What is the unit of measurement for focal length?
What is the unit of measurement for focal length?
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