By properly combining two prisms made of different materials, it is possible to:
Explanation:
Consider the case of prisms combined such that the refractive angles are reversed w.r.t. each other. Then, the net deviation of the yellow ray will be,
$\delta_\text{y}=(\mu_\text{y}-1)\text{A}-(\mu_\text{y}'-1)\text{A}'$
And, the net angular dispersion will be
$\delta_\text{y}-\delta_\text{r}=(\mu_\text{y}-1)\text{A}(\omega-\omega')$
Thus, by choosing appropriate conditions, we can have the above mentioned cases.
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Energy bands in solids are a consequence of
|
(a) Ohm’s Law |
(b) Pauli’s exclusion principle |
|
(c) Bohr’s theory |
(d) Heisenberg’s uncertainty principle |
A beam of plane polarized light falls normally on a polarizer of cross sectional area 3 
. Flux of energy of incident ray in 10–3 W. The polarizer rotates with an angular frequency of 31.4 rad/sec. The energy of light passing through the polarizer per revolution will be
|
(a) 10–4 Joule |
(b) 10–3 Joule |
(c) 10–2 Joule |
(d) 10–1 Joule |
A far sighted man who has lost his spectacles, reads a book by looking through a small hole (3-4 mm) in a sheet of paper. The reason will be
|
(a) Because the hole produces an image of the letters at a longer distance |
|
(b) Because in doing so, the focal length of the eye lens is effectively increased |
|
(c) Because in doing so, the focal length of the eye lens is effectively decreased |
|
(d) None of these |
The wavelength of light diminishes μ times (μ = 1.33 for water) in a medium. A diver from inside water looks at an object whose natural colour is green. He sees the object as
|
(a) Green |
(b) Blue |
(c) Yellow |
(d) Red |
Light takes 8 min 20 sec to reach from sun on the earth. If the whole atmosphere is filled with water, the light will take the time (a
|
(a) 8 min 20 sec |
(b) 8 min |
(c) 6 min 11 sec |
(d) 11 min 6 sec |
Eddy currents are produced when
|
(a) A metal is kept in varying magnetic field |
|
(b) A metal is kept in the steady magnetic field |
|
(c) A circular coil is placed in a magnetic field |
|
(d) Through a circular coil, current is passed |
The electric field in a region is radially outward with magnitude E = 
. The charge contained in a sphere of radius 
centered at the origin is
|
(a) |
(b) |
(c) |
(d) |
The forbidden gap in the energy bands of germanium at room temperature is about
|
(a) 1.1 eV |
(b) 0.1 eV |
(c) 0.67 eV |
(d) 6.7 eV |
The binding energy of deuteron 
is 1.112 MeV per nucleon and an α - particle 
has a binding energy of 7.047 MeV per nucleon. Then in the fusion reaction 
the energy Q released is
|
(a) 1 MeV |
(b) 11.9 MeV |
(c) 23.8 MeV |
(d) 931 MeV |
