When a glass prism of refracting angle 60o is immersed in a liquid its angle of minimum deviation is 30o. The critical angle of glass with respect to the liquid medium is ____.
42o
45 o
50 o
52 o
Three prisms 1, 2 and 3 have the prism angle A = 60o, but their refractive indices are respectively 1.4, 1.5 and 1.6. If (1, (2, (3 be their respective angles of deviation then ____.
(3 > (2 > (1
(1 > (2 > (3
(1 = (2 = (3
(2 > (1 > (3
Which one of the following alternative is FALSE for a prism placed in a position of minimum deviation?
i1 = i2
r1 = r2
i1 = r1
All of the above
In the visible region the dispersive powers and the mean angular deviations for crown and flint glass prisms are(, (( and d, d( respectively. The condition for getting deviation without dispersion when the two prisms are combined is ____.
A ray of light passes through the equilateral prism such that angle of incidence is equal to the angle of emergence if the angle of incidence is 45o. The angle of deviation is ____.
15o
75 o
60 o
30 o
The solar spectrum during a complete solar eclipse is ____.
continuous
emission line
dark line
dark band
Why sun has elliptical shape on the time when rising and sun setting? It is due to ____.
refraction
reflection
scattering
dispersion
In the formation of a rainbow light from the sun on water droplets
Undergoes ____.
dispersion only
only total internal reflection
dispersion and total internal reflection
None of the above
The Cauchy’s dispersion formula is ____.
A prism of refractive index has a refracting angle of 60o. At what angle a ray must be incident on it so that it suffers a minimum deviation?
45o
60o
90o
180o
A convex lens, a glass slab, a glass prism and a solid sphere all are made of the same glass, the dispersive power is ____.
in the glass slab and prism
in the lens and solid sphere
only in prism
in all the four
A parallel beam of white light falls on a convex lens. Images of blue, yellow and red light are formed on other side of the lens at a distance of 0.20 m, 0.205 m and 0.214 m respectively. The dispersive power of the material of the lens is ____.
619/1000
9/200
14/205
5/214
The refractive index of the material of the prism for violet colour is 1.69 and that for red is 1.65. If the refractive index for mean colour is 1.66, the dispersive power of the material of the prism ____.
0.65
0.69
0.66
0.06
If the angle of prism is and the angle of minimum deviation is , the angle of refraction is ____.
The refractive index of a particular material is 1.67 for blue light, 1.65 for yellow light and 1.63 for red light. The dispersive power of the material is ____.
0.0615
0.024
0.031
1.60
A beam of light composed of red and green ray is incident obliquely at a point on the face of rectangular glass slab. When coming out on the opposite parallel face, the red and green ray emerge from ____.
two points propagating in two different directions
two points propagating in two parallel directions
one point propagating in two different directions
one point propagating in the same directions
White light is passed through a prism........... colour shows minimum deviation ____.
red
violet
yellow
green
A ray of monochromatic light suffers minimum deviation of while passing through a prism of refracting angle. Refractive index of the prism material is ____.
1.5
1.3
0.8
2.4
A ray incident a on one refracting surface of a prism of angle, suffers a deviation of. What is the angle of emergence?
None of the above
The spectrum obtained from a sodium vapour lamp is an example of ____.
absorption spectrum
emission spectrum
continuous spectrum
band spectrum