When tiny circular obstacle is placed in the path of light from a distance source , a bright spot is seen at the centre of the obstacle.
I. It happens due to
II. Polarization of light waves
III. Diffraction of light waves
IV. Interference of light waves
V. Scattering of light waves
I. It happens due to
II. Polarization of light waves
III. Diffraction of light waves
IV. Interference of light waves
V. Scattering of light waves
III. Diffraction of light waves
The penetration of light into the region of geometrical shadow is known as
a. Interference of light
b. Diffraction of light
c. Refraction of light
d. Polarization of light
When a compact disc is illuminated by a source of white light , colored lines are observed. This is due to
I. Interference
II. Diffraction
III. Dispersion
IV. Refraction
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
In a YDSE experiment a monochromatic source of light is used. The shape of the interference fringes formed on a screen is
I. Parabola
II. Hyperbola
III. Straight line
IV. Circle
Polarization of light proves the :
a. corpuscular nature of light
b. quantum nature of light
c. Transverse wave nature of light
d. Longitudinal wave nature of light
When a polaroid is rotated, the intensity of light varies but never reduces to zero. It shows that theincident light is:
a. Unpolarised
b. completely plane polarised
c. partially plane polarised
d. one of the above
Polaroid glasses is used in sun glasses because :
a. It reduces the light intensity to half on account of polarization
b. It is fashionable
c. It has good colour
d. It is cheaper
In Young’s double slit experiment the distance between the slit and the screen is doubled and the separation between the slit is reduced to half. The fringe width:
(a) is doubled
(b) become four time
(c) is halved
(d) remain unchanged
The ratio of intensities at minima to the maxima in young’s double slit experiment is 9 : 25. Find the ratio of the widths of two slits.
(A) 16: 1
(B) 1: 16
(C) 4 : 1
(D) 1 : 4
Two cables of copper are of equal lengths. One of them has a single wire of area of cross- section A, while other has 10 wires of cross-sectional area A/10 each. Give their suitability for transporting A.C. and D.C.
(a) only multiple strands for A.C., either for D.C.
(b) only multiple strands for A.C., only single strand for D.C.
(c) only single strand for D.C., either for A.C.
(d) only single strand for A.C., either for D.C.
The wave-front due to source situated at the infinity is
(A) Spherical
(B) Cylindrical
(C) Plane
(D) Rectangular
When 2 × \(10^{11}\) electrons are removed from a neutral metal sphere, the charge on the sphere becomes:
(A) -16 nC
(B) 16 nC
(C) -32 nC
(D) 32nC
Select the correct statements from the following
(i) inside a charged or neutral conductor, electrostatic field is zero.
(ii) the electrostatic field at the surface of the charged conductor must be tangential to the surface at any point.
(iii) there is no net charge at any point inside the conductor.
(A) (i) and (ii)
(B) i) and (iii)
(C) (ii) and (iii)
(D) (i), (ii), and (iii)