What causes chromatic aberration?
- AMarginal rays
- BCentral rays
- CDifference in radii of curvature of its surfaces
- DVariation of focal length of lens with colour
What causes chromatic aberration?
Explanation:
Chromatic aberration occurs when a lens is either unable to bring all wavelengths of color to the same focal plane and/or wavelengths of color are focused at different positions in the focal plane.
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In a cyclotron, the angular frequency of a charged particle is independent of
|
(a) Mass |
(b) Speed |
(c) Charge |
(d) Magnetic field |
The radius of a circular loop is r and a current i is flowing in it. The equivalent magnetic moment will be
|
(a) ir |
(b) 2πir |
(c) iπ |
(d) |
A potentiometer wire of length 1 m and resistance 10 W is connected in series with a cell of emf 2V with internal resistance 1 W and a resistance box including a resistance R. If potential difference between the ends of the wire is 1 mV, the value of R is
|
(a) 20000 W |
(b) 19989 W |
(c) 10000 W |
(d) 9989 W |