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Questions and Answers
What is the focal length of a spherical mirror with a radius of curvature of 20cm?
What is the focal length of a spherical mirror with a radius of curvature of 20cm?
- 12 cm
- 10 cm (correct)
- 2 cm
- -10 cm
What is the power of a concave lens with a focal length of 200 cm?
What is the power of a concave lens with a focal length of 200 cm?
- 0.5 D (correct)
- 0.8 D
- 1.5 D
- 5 D
What is the focal length of a plane mirror?
What is the focal length of a plane mirror?
- -25 cm
- 25 cm
- 0
- infinite (correct)
What does the electrical resistivity of a metallic wire depend upon?
What does the electrical resistivity of a metallic wire depend upon?
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Which device is used to measure electric current?
Which device is used to measure electric current?
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Study Notes
Mirror and Lens Properties
- The focal length of a spherical mirror is half the radius of curvature, so a spherical mirror with a radius of curvature of 20cm has a focal length of 10cm.
- The power of a concave lens is the reciprocal of its focal length in meters, so a concave lens with a focal length of 200cm has a power of 1/2 diopters.
- The focal length of a plane mirror is infinite.
Electrical Properties
- The electrical resistivity of a metallic wire depends on the material of the wire, its length, and its cross-sectional area.
- An ammeter is a device used to measure electric current.
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