Explanation:
White light will split into different colours inside the glass slab because the value of refractive index is different for different wavelengths of light; thus, they suffer different deviations. But the emergent light will be white light. As the faces of the glass slide are parallel, the emerging lights of different wavelengths will reunite after refraction.
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An electric dipole of moment p is placed in the position of stable equilibrium in uniform electric field of intensity E. It is rotated through an angle θ from the initial position. The potential energy of electric dipole in the final position is
|
(a) pEcosθ |
(b) pEsinθ |
(c) pE(1- cosθ) |
(d) -pEcosθ |
With the increase in principle quantum number, the energy difference between the two successive energy levels
|
(a) Increases |
|
(b) Decreases |
|
(c) Remains constant |
|
(d) Sometimes increases and sometimes decreases |
An achromatic combination of lenses produce:
Four resistances 10 W, 5 W, 7 W and 3 W are connected so that they form the sides of a rectangle AB, BC, CD and DA respectively. Another resistance of 10 W is connected across the diagonal AC. The equivalent resistance between A and B is
|
(a) 2 W |
(b) 5 W |
(c) 7 W |
(d) 10 W |
A ray of light incidents on a plane mirror at an angle of 30°. The deviation produced in the ray is
| (a) 30° | (b) 60° | (c) 90° | (d) 120° |
"Lux" is a unit of
|
(a) Luminous intensity of a source |
(b) Illuminance on a surface |
|
(c) Transmission coefficient of a surface |
(d) Luminous efficiency of source of light |