An achromatic combination of lenses produce:
- AImages in black and white
- BColored images
- CImages unaffected by variation of refractive index with wavelength
- DHighly enlarged images
An achromatic combination of lenses produce:
Explanation:
An achromatic combination of lenses provide deviation without dispersion. So, images are unaffected by variation of refractive index with wavelength.
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The diameter of each plate of an air capacitor is 4 cm. To make the capacity of this plate capacitor equal to that of 20 cm diameter sphere, the distance between the plates will be
|
(a) 4 |
(b) 1 |
(c) 1 cm |
(d) 1 |
Two metal spheres of radii and
are charged to the same potential. The ratio of charges on the spheres is
|
(a) |
(b) |
(c) |
(d) |
Two resistors are connected (a) in series (b) in parallel. The equivalent resistance in the two cases are 9 ohm and 2 ohm respectively. Then the resistances of the component resistors are
|
(a) 2 ohm and 7 ohm |
(b) 3 ohm and 6 ohm |
(c) 3 ohm and 9 ohm |
(d) 5 ohm and 4 ohm |
A toroid has number of turns per unit length n, current i, then the magnetic field is
|
(a) |
(b) |
(c) |
(d) None of these |
In an interference experiment, the spacing between successive maxima or minima is (Where the symbols have their usual meanings)
|
(a) |
(b) |
(c) |
(d) |
A real image is formed by: