MCQ
Bartholinus discovered:
- AInterference by splitting the wave front
- BPolarisation by reflection
- CPolarisation by refraction
- DPolarisation by double refraction
✓
Answer
- Polarisation by double refraction
Explanation:
In 1669, another Danish scientist, Erasmus Bartholinus discovered the polarization of light by double refraction in Iceland spar (calcite).
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
In which of the following transitions will the wavelength be minimum?
- n = 5 to n = 4
- n = 4 to n = 3
- n = 3 to n = 2
- n = 2 to n = 1
The number of turns of primary and secondary coils of a transformer are 5 and 10 respectively and the mutual inductance of the transformer is 25 henry. Now the number of turns in the primary and secondary of the transformer are made 10 and 5 respectively. The mutual inductance of the transformer in henry will be
|
(a) 6.25 |
(b) 12.5 |
(c) 25 |
(d) 50 |
In image formation from spherical mirrors, only paraxial rays are considered because they:
- Are easy to handle geometrically.
- Contain most of the intensity of the incident light.
- Form nearly a point image of a point source.
- Show minimum dispersion effect.
Consider an electron (m = 9.1 
confined by electrical forces to move between two rigid walls separated by 1.0 
metre, which is about five atomic diameters. The quantised energy value for the lowest stationary state is
|
(a) 12 |
(b) 6.0 |
(c) 6.0 |
(d) 6 Joule |
An LCR series circuit with $100\Omega$ resistance is connected to an ac source of 200V and of frequency of $\frac{300 \text{rad}}{\text{s}}$. When only the capacitance is removed, the current lags behind the voltage by 600. When only the inductance is removed, the current leads the voltage by 60° the current through the circuit is:
→The wavelength 21 cm emitted by atomic hydrogen in interstellar space belongs to
|
(a) Radio waves |
(b) Infrared waves |
(c) Microwaves |
(d) g-rays |
The acceleration of moon with respect to earth is 0⋅0027ms-2 and the acceleration of an apple falling on earth's surface is about 10ms-2. Assume that the radius of the moon is one fourth of the earth's radius. If the moon is stopped for an instant and then released, it will fall towards the earth. The initial acceleration of the moon towards the earth will be:
- 10ms-2
- 0.0027ms-2
- 6.4ms-2
- 5.0ms-2
An electron passing through a potential difference of 4.9 V collides with a mercury atom and transfers it to the first excited state. What is the wavelength of a photon corresponding to the transition of the mercury atom to its normal state
|
(a) 2050 Å |
(b) 2240 Å |
(c) 2525 Å |
(d) 2935 Å |
Assertion : All the radioactive elements are ultimately converted in lead.
Reason : All the elements above lead are unstable.
|
(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. |
X−ray falling on a material.