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.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A condenser of capacitance 10 μF has been charged to 100 volts. It is now connected to another uncharged condenser in parallel. The common potential becomes 40 volts. The capacitance of another condenser is
|
(a) 15 μF |
(b) 5 μF |
(c) 10 μF |
(d) 16.6 μF |

Which of the following waves have the maximum wavelength
|
(a) X-rays |
(b) I.R. rays |
(c) UV rays |
(d) Radio waves |
Two different coils have self-inductance
,
. The current in one coil is increased at a constant rate. The current in the second coil is also increased at the same rate. At a certain instant of time, the power given to the two coils is the same. At that time the current, the induced voltage and the energy stored in the first coil are
and
respectively. Corresponding values for the second coil at the same instant are
and
respectively. Then
|
(a) |
(b) |
(c) |
(d) a, b, c |