Question
Coherent sources are obtained in the use of double prism experiment :

Answer

(B) - by refraction

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

If a dielectric introduced between the plates of a parallel plate condenser, then which of the following is possible:
A long, straight wire carries a current i. The magnetizing field intensity H is measured at a point P close to the wire. A long, cylindrical iron rod is brought close to the wire so that the point P is at the centre the rod. The value of H at P will:
The magnetic moment of a magnet of length $10 \ cm$ and pole strength $4.0 \ Am$ will be
Choose the correct answer from alternatives given.
If $\overrightarrow{\text{E}}$ and $\overrightarrow{\text{B}}$ represent electric and magnetic field vectors of an electromagnetic wave, the direction of propagation of the wave is along.
A star is moving away from the earth with a velocity of $100 \ km/s.$ If the velocity of light is $3 \times 10^8\ m/s$  then the shift of its spectral line of wavelength $5700 \mathring A$ due to Doppler's effect will be
A potential difference of $42,000$ volts is used in an $X-$ray tube to accelerate electrons. The maximum frequency of the $X-$radiations produced is $(1 \ eV=1.6 \times 10^{-19} \mathrm{~J}$ and $ \mathrm{h}=6.63 \left.\times 10^{-34} \mathrm{~J}-\mathrm{sec}\right)$
Five lumen/watt is the luminous efficiency of a lamp and its luminous intensity is 35 candela. The power of the lamp is(a) 80 W (b) 176 W(c) 88 W  (d) 36 W
       
An object is placed at a distance u from a simple microscope of focal length f. The angular magnification obtained depends:
In a cathode ray tube, what is the effect on the beam of particles if a hotter filament is used?
A star is going away from the earth. An observer on the earth will see the wavelength of light coming from the star(a) Decreased(b) Increased(c) Neither decreased nor increased(d) Decreased or increased depending upon the velocity of the star