Atomic radius of fcc is
|
(a) |
(b) |
(c) |
(d) |
Atomic radius of fcc is
|
(a) |
(b) |
(c) |
(d) |
(b) ![]()
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A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of incident beam. At the first maximum of the diffraction pattern the phase difference between the rays coming from the edges of the slit is
|
(a) 0 |
(b) |
(c) |
(d) 2 |
Two lenses have focal lengths
and
and their dispersive powers are
and
respectively. They will together form an achromatic combination if
|
(a) |
(b) |
|
(c) |
(d) |
The minimum intensity of light to be detected by human eye is
. The number of photons of wavelength 5.6
entering the eye, with pupil area
, per second for vision will be nearly
|
(a) 100 |
(b) 200 |
(c) 300 |
(d) 400 |
