Wavefront generated from a line source is
a. Cylindrical wavefront
b. Spherical wavefront
c. Plane front
d. Either a.) or b.)
a. Cylindrical wavefront
b. Spherical wavefront
c. Plane front
d. Either a.) or b.)
a. Cylindrical wavefront
What type of wave front will emerge from any distant source of light?
i. Spherical wave front
ii. Cylindrical wave front
iii. Plane wave front
iv. None of these
The wavefront due to a source situated at infinity is
(a) spherical
(b) cylindrical
(c) planar
(d) circular
Bending of Light phenomena is shown by
(a) Polarization
(b) Diffraction
(c) Interference
(d) Dispersion
Which of the following is conserved when light waves interefere?
a. Energy
b.Phase
c. Intensity
d. Amplitude
The wave-front due to source situated at the infinity is
(A) Spherical
(B) Cylindrical
(C) Plane
(D) Rectangular
The colours on the soap bubble is due to
(a) Interference
(b) Diffraction
(c) Polarisation
(d) Reflection
Huygens theory could not explain
a. Reflection of light
b. Photoelectric effect
c. Interference of light
d. Diffraction of light
An unpolarised beam of intensity \(I_0\) is incident on a pair of nicols making angle of 60° with each other. The intensity of right emerging from the pair is
Two currents loops are concentric and lie in the same plane. The current in the outer loop is anti clockwise and increasing with time. The induced current in the inner loop ,is
(a) Clockwise
(b) Zero
(c) Counter-clockwise
(d) None of these
Four charges 2C,-3C,-4C and 5C respectively are placed at the four corners of a square .Which of the following statements is true for the point of intersection of the diagonals.
1. E=0,V=0
2. E=0 V≠0
3. E≠0 V=0
4. E≠0 V≠0
Five resistances are combined according to the figure. The equivalent resistances between the points X and Y will be
(a) 10 Ω
(b) 22 Ω
(c) 20 Ω
(d) 50 Ω
A wire in the form of a circular loop, of one turn carrying a current, produces magnetic induction B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is-
a) B
b) 4B
c) 2B
d) 8B.
The wave-front due to source situated at the infinity is
(A) Spherical
(B) Cylindrical
(C) Plane
(D) Rectangular
Two sources of light are said to be coherent, when they give light waves of same
(a) amplitude and phase.
(b) wavelength and constant phase difference.
(c) intensity and wavelength.
(d) phase and speed.