MCQ
Coherent sources are obtained in the use of double prism experiment :
- Aby reflection
- ✓by refraction
- Cby interference
- Dby diffraction
✓
Answer
Correct option: B.
by refraction
(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.
Explore more
Similar questions
An electric bulb illuminates a plane surface. The intensity of illumination on the surface at a point 2m away from the bulb is 5 
phot (lumen/cm2). The line joining the bulb to the point makes an angle of 60o with the normal to the surface. The intensity of the bulb in candela is
|
(a) 40 |
(b) 40 |
(c) 20 |
(d) 40 |
A point object is placed at a distance of 30 cm from a convex mirror of focal length 30cm. The image will form at
|
(a) Infinity |
(b) Focus |
|
(c) Pole |
(d) 15 cm behind the mirror |
A light has amplitude A and angle between analyser and polariser is 60°. Light is reflected by analyser has amplitude
|
(a) A |
(b) A/ |
(c) |
(d) A/2 |
Assertion : Kinetic energy of photo electrons emitted by a photosensitive surface depends upon the intensity of incident photon.
Reason : The ejection of electrons from metallic surface is possible with frequency of incident photon below the threshold frequency.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Consider telecommunication through optical fibres. Which of the following statements is not true
|
(a) Optical fibres may have homogeneous core with a suitable cladding |
|
(b) Optical fibres can be of graded refractive index |
|
(c) Optical fibres are subject to electromagnetic interference from outside |
|
(d) Optical fibres have extremely low transmission loss |
What percentage of original radioactive atoms is left after five half lives
|
(a) 0.3% |
(b) 1% |
(c) 31% |
(d) 3.125% |
Image formed in compound microscope is :
Range of frequencies allotted for commercial FM radio broadcast is
|
(a) 88 to 108 MHz |
(b) 88 to 108 kHz |
(c) 8 to 88 MHz |
(d) 88 to 108 GHz |
Which of the following transition will have highest emission wavelength
|
(a) n = 2 to n = 1 |
(b) n = 1 to n = 2 |
(c) n = 2 to n= 5 |
(d) n = 5 to n = 2 |
The potential gradient along the length of a uniform wire is 10 volt/metre. B and C are the two points at 30 cm and 60 cm point on a meter scale fitted along the wire. The potential difference between B and C will be
|
(a) 3 volt |
(b) 0.4 volt |
(c) 7 volt |
(d) 4 volt |