A parallel beam of monochromatic light is incident at one surface of a equilateral prism. Angle of incidence is 55° and angle of emergence is 46°. The angle of minimum deviation is ____.
loess than 41°
equal to 41°
more than 41°
None of the above
The spectrum of light emitted by a glowing solid is ____.
continuous spectrum
line spectrum
band spectrum
absorption spectrum
Which of the following element was discovered by study of Fraunhofer
Lines?
Hydrogen
Oxygen
Helium
Ozone
By placing the prism in minimum deviation position, images of the
spectrum ____.
becomes inverted
becomes broader
becomes distinct
becomes intensive
Our eye is most sensitive for which of the following wavelength ____.
4500 Å
5500 Å
6500 Å
Equally sensitive for all wave lengths of visible spectrum
If the refractive indices of crown glass for red, yellow and violet colours are 1.5140, 1.5170 and 1.5318 respectively and for flint glass these are 1.6434, 1.6499 and 1.6852 respectively, then the dispersive powers for crown and flint glass are respectively ____.
0.034 and 0.064
0.064 and 0.034
1.00 and 0.064
0.034 and 1.0
The minimum temperature of a body at which it emits light is ____.
1200°C
1000°C
500°C
200°C
Band spectrum is obtained when the source emitting light is in the form of or
Band spectrum is characteristic of ____.
atoms
molecules
plasma
None of the above
Flint glass prism is joined by a crown glass prism to produce dispersion without deviation. The refractive indices of these for mean rays are 1.602 and 1.500 respectively. Angle of prism of flint prism is 10°, and then the angle of prism for crown prism is ____.
12°2.4'
12°4’
1.24°
12°
In the position of minimum deviation when a ray of yellow light passes through the prism, then its angle of incidence is ____.
less than the emergent angle
greater than the emergent angle
sum of angle of incidence and emergent angle is 90°
equal to the emergent angle
A circular disc of which 2/3 part is coated with yellow and 1/3 part is with blue. It is rotated about its central axis with high velocity, and then it is seen as ____.
green
brown
white
violet
The fine powder of a coloured glass is seen as ____.
coloured
white
that of the glass colour
black
When a white light passes through a hollow prism, then ____.
there is no dispersion and no deviation
dispersion but no deviation
deviation but no dispersion
there is dispersion and deviation both
The light ray is incidence at angle of 60° on a prism of angle 45°. When the light ray falls on the other surface at 90°, the refractive index of the material of prism and the angle of deviation are given by ____.
In dispersion without deviation ____.
the emergent rays of all the colours are parallel to the incident ray
yellow coloured ray is parallel to the incident ray
only red coloured ray is parallel to the incident ray
all the rays are parallel, but not parallel to the incident ray
Deviation of 5° is observed from a prism whose angle is small and whose refractive index is 1.5. The angle of prism is ____.
7.5°
10°
5°
3.3°
The refractive indices of violet and red light are 1.54 and 1.52 respectively. If the angle of prism is 10°, then the angular dispersion is ____.
0.02
0.2
3.06
30.6
The angle of minimum deviation measured with a prism is 30° and the angle of prism is 60°. The refractive index of prism material is ____.
2
If the refractive indices of a prism for red, yellow and violet colours be 1.61, 1.63 and 1.65 respectively, then the dispersive power of the prism is ____.
The minimum deviation produced by a hollow prism filled with a certain liquid is found to be 30°. The light ray is also found to be refracted at angle of 30°. The refractive index of the liquid is ____.