Wave Optics Test

Result

Wave Optics Test - 43

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Weekly Quiz Competition

Question 1
4 / -1

Two polaroids are placed in the path of unpolarized beam of intensity I₀ such that no light is emitted from the second polaroid. If a third polaroid whose polarization axis makes an angle θ with the polarization axis of first polaroid, is placed between these polaroids then the intensity of light emerging from the last polaroid will be

A

B

C

D

Solution
Question 2
4 / -1

A light has amplitude A and angle between analyser and polariser is 60°. Light is reflected by analyser has amplitude

A

B

C

D

Solution
Question 3
4 / -1

When light is incident on a doubly refracting crystal, two refracted rays-ordinary ray (O–ray) and extra ordinary ray (E–ray) are produced. Then

A
Both O–ray and E–ray are polarised perpendicular to the plane of incidence

B
Both O–ray and E–ray are polarised in the plane of incidence

C
E–ray is polarised perpendicular to the plane of incidence and O–ray in the plane of incidence

D
E–ray is polarised in the plance of incidence and O–ray perpendicular to the plane of incidence
Question 4
4 / -1

Light passes successively through two polarimeter tubes each of length 0.29 m. The first tube contains dextro rotatory solution of concentration 60 kgm^–3 and specific rotation 0.01 rad m² kg^–1. The second tube contains laevo rotatory solution of concentration 30 kg/m³ and specific rotation 0.02 rad m²kg^–1. The net rotation produced is

A
15°

B
0°

C
20°

D
10°

Solution
Question 5
4 / -1

V₀ and V_E represent the velocities, µ₀ and µ_E the refractive indices of ordinary and extraordinary rays for a doubly refracting crystal. Then

A
V₀ ≥ V_E , µ₀ ≤ µ_E if the crystal is calcite

B
V₀ ≤ V_E , µ₀ ≤ µ_E if the crystal is quartz

C
V₀ ≤ V_E , µ₀ ≥ µ_Eif the crystal is calcite

D
V₀ ≥ V_E , µ₀ ≥ µ_E if the crystal is quartz

Solution
Question 6
4 / -1

Polarising angle for water is 53°4’. If light is incident at this angle on the surface of water and reflected, the angle of refraction is

A
53°4'

B
126°56'

C
36°56'

D
30°4'

Solution
Question 7
4 / -1

When a plane polarised light is passed through an analyser and analyser is rotated throught 90°, the intensity of the emerging light

A
Varies between maximum and minimum

B
Becomes zero

C
Does not vary

D
Varies between a maximum and zero
Question 8
4 / -1

Two Nicols are oriented with their principal planes making an angle of 60°. The percentage of incident unpolarized light which passes through the system is

A
50%

B
100%

C
12.5%

D
37.5%

Solution
Question 9
4 / -1

Unpolarized light falls on two polarizing sheets places one on top of the other. What must be the angle between the characteristic directions of the sheets if the intensity of the first transmitted light is one-third the maximum intensity of the first transmitted beam?

A
75°

B
55°

C
35°

D
15°

Solution
Question 10
4 / -1

Unpolarized light of intensity 32Wm^–2 passes through three polarizers such that transmission axes of the first and second polarizer makes an angle 30° with each other the transmission axis of the last polarizer is crossed with that of the first. The intensity of final emerging light will be

A
32 Wm^–2

B
3 Wm^–2

C
8 Wm^–2

D
4 Wm^–2

Solution