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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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Description
Test your knowledge of optics and electricity with this Class 10 Science quiz. Answer very short questions on topics like the focal length of spherical mirrors, power of concave lenses, and electrical resistivity of metallic wires.
