MCQ Polarisation, Class 12 Physics

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying.

1. An unpolarised beam of intensity Io is incident on a polarizer and analyser placed in contact. The angle between the transmission axes of the polarizer and the analyser is θ. What is the intensity of light emerging out of the analyser?

(I₀ cos 2θ)/2

I₀ cos2θ

I₀ cosθ

I₀

Question 1 of 10

2. The Brewster’s angle for a transparent medium is 60⁰.The angle of incidence is

45⁰

90⁰

60⁰

30⁰

Question 2 of 10

3. The device or arrangement to detect and check plane polarized light is called

Optically active

Polaroid

Polarizer

Analyser

Question 3 of 10

4. If the light is completely polarized by reflection, then angle between the reflected and refracted light is

π

2π

π/2

π/4

Question 4 of 10

5. The intensity of light transmitted by the analyzer is maximum when

The transmission axes of the analyzer and the polarizer are perpendicular

The reflected ray is fully polarized

The transmission axes of the analyzer and the polarizer are parallel

The reflected ray is partially polarized

Question 5 of 10

6. A ray of light is incident on the surface of glass plate at an angle of incidence equal to Brewster's angle Ø. If μ represents the refractive index of glass with respect to air, then the angle between the reflected and refracted rays is:

90°- sin^-1 (sinØμ)

90 + Ø

sin^-1 (μ cosØ)

90°

Question 6 of 10

7. A polaroid is placed at 45° to an incoming light of intensity I₀. Now the intensity of light passing through the poloroid after polarisation would be:

zero

I₀ /2

I₀

I₀ /4

Question 7 of 10

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

3/2

√3

√3/2

1/2

Question 8 of 10

9. An unpolarised beam of intensity 2a² passes through a thin polaroid. Assuming zero absorption in the polaroid, the intensity of emergent plane polarised light will be

a²

2a²

√2 a²

a² / √2

Question 9 of 10

10. A rotating calcite crystal is placed over an ink dot. On seeing through the crystal one finds:

Two stationary dots

Two dots moving along straight lines

One dot rotating about the other

Both dots rotating about a common axis

Question 10 of 10

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