- AExplaining polarisation
- BDetermining focal length of lenses
- CDetermining chromatic aberration
- DGeometrical reconstruction of a wavefront
Explanation:
Huygens considered that light was propagated in longitudinal waves.
Huygen's concept explained the direction of propagation of light waves by geometrical reconstruction of wavefront.
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The nature of binding for a crystal with alternate and evenly spaced positive and negative ions is
|
(a) Covalent |
(b) Metallic |
(c) Dipolar |
(d) Ionic |
Shift by which the object appears to be raised depends on:
Magnetic field due to 0.1 A current flowing through a circular coil of radius 0.1 m and 1000 turns at the centre of the coil is
|
(a) 2 |
(b) 4.31 |
(c) 6.28 |
(d) 9.81 |
Doping of intrinsic semiconductor is done
|
(a) To neutralize charge carriers |
|
(b) To increase the concentration of majority charge carriers |
|
(c) To make it neutral before disposal |
|
(d) To carry out further purification |
Assertion : For a perfectly diamagnetic substance permeability is always one.
Reason : The ability of a material of permit the passage of magnetic lines of force through it is called magnetic permeability.
|
(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 assertion is false but reason is true. |
