When the light is incident at the polarizing angle on the transparent medium, then the completely polarized light is

refracted light
reflected light
refracted and reflected light
neither reflected nor refracted light

Solution

When the light is incident at the polarising angle on the transparent medium, the reflected light is completely polarised.

When light passing through rotating nicol is observed,no change in intensity is seen. What inference can be drawn ?

The incident light is unpolarized.
The incident light is circularly polarized.
The incident light is unpolarized or circularly polarized.
The incident light is unpolarized or circularly polarized or combination of both.

In Young’s double slit experiment with sodium vapour lamp of wavelength 589 nm and the slits 0.589 mm apart, the half angular width of the central maximum is

sin^–1(0.01)
sin^–1(0.0001)
sin^–1(0.001)
sin^–1(0.1)

Solution

Light from two coherent sources of the same amplitude A and wavelength λ lilluminates the screen. The intensity of the central maximum is I₀. If the sources were incoherent,the intensity at the same point will be

4I₀
1I₀
I₀
I₀/2

Solution

The condition for obtaining secondary maxima in the diffraction pattern due to single slit is

a sin θ = nλ
a sin θ = (2n - 1)^λ⁄₂
a sin θ = (2n - 1)λ
a sin θ = ^nλ⁄₂

Two beams of light of intensity I₁ and I₂ interfere to givean interference pattern. If the ratio of maximum intensity to that of minimum intensity is 25/9, then I₁/I₂ is

5/3
4
81/625
16

Solution

A slit of width a is illuminated by red light of wavelength 6500 Å. If the first minimum falls at q= 30°, the value of a is

6.5 × 10^–4mm
1.3 micron
3250 Å
2.6 × 10^–4cm

Solution

According to principle of diffraction, a sin q= nλ

where, n = order of secondary minimum

or,a sin 30° =1 ×(6500 × 10^-10)

or, a = 1.3 × 10^–6m, or, a= 1.3 micron.

Angular width (B) of central maxima of a diffraction pattern of a single slit does not depend upon

distance between slit and source
wavelength of the light used
width of slit
frequency of light used

Solution

The wavelength of H_α line in hydrogen spectrum was found to be 6563 Å in the laboratory. If the wavelength of same line in the spectrum of a milky way is observed to be 6568 Å,then recession velocity of milky way will be

105 m/s
1.05 × 10⁶m/s
10.5 × 10⁶m/s
0.105 × 10⁶m/s

Solution

A ray of light strikes a glass plate at an angle of 60º. If the reflected and refracted rays are perpendicular to each other,the index of refraction of glass is

¹⁄₂
\(\sqrt{\frac{3}{2}}\)
³⁄₂
1.732

Solution

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