An electromagnetic beam has an intensity 16 W/m2 and is linearly polarized vertically. What is the intensity of the transmitted beam, if the angle of incidence on the polaroid is 45° with the vertical?

An electromagnetic beam has an intensity 28 W/m2 and is linearly polarized vertically. What is the intensity of the transmitted beam, if the angle of incidence on the polaroid is 45o with the vertical?

A

10 Wm-1

B

12 Wm-1

C

14 Wm-1

D

16 Wm-1

A polarized light of Intensity 40 Wm2 is incident on the analyzer at a certain angle. If the transmitted beam has an Intensity of 20 Wm2, the angle made with the vertical is _____________

A

30°

B

45°

C

60°

D

75°

A polarized light of Intensity 35 Wm2 is incident on the analyzer at a certain angle. If the transmitted beam has an Intensity of 30 Wm2, the angle made with the vertical is __________

A

23°

B

34°

C

47°

D

19°

Consider the following statements. i) For a perfect reflection, the angle of incidence will be equal to the angle of reflection. ii) The critical angle is the angle of incidence in the denser medium for which the angle of refraction in the rarer medium is 90°. Which of the above statements are true?

A

Both i & ii

B

Only i

C

Only ii

D

None

Unpolarized light of intensity I passes through a single polaroid, the intensity of polarized light is approximately

A

I

B

2I

C

I/2

D

I/4

Consider the following statements with regards to the shear force diagram for the beam ABCD: 1. The beam ABCD is an overhanging beam having supports at A and D only. 2. The beam carries a point load of 20 kN at C. 3. The beam carries a concentrated load of 10 kN at the end B. 4. The beam is an overhanging beam having supports at C and D only. 5. The beam carries a uniformly distributed load of 70 kN over the left hand portion AC only. Which of the above statements are correct?

A

1, 2 and 3 only

B

1, 3 and 5 only

C

2, 3 and 4 only

D

2, 4 and 5 only

Consider a beam of light is incident on a glass slap of refractive index 1.54 is reflected from the surface with an angle of incidence 33°. Now if the reflected ray is passed through a polaroid as shown below, in such case which of the following statement is correct? (Given tan 57° = 1.54)

A

The intensity is reduced down to zero and remains zero

B

The intensity reduces down some what and rises again

C

There is no change in intensity

D

The intensity gradually reduces to zero and then again increases

Consider the following statements regarding types of supports and beams: 1. When both supports of beams are roller supports, the beam is known as simply supported beam. 2. A beam with one end fixed and the other end free is known as fixed beam. 3. A beam with both ends fixed is known as cantilever beam. 4. A beam with one end fixed and the other simply supported is known as propped cantilever. Which of the above statements is/are correct ?

A

1 only

B

1 and 4 only

C

1, 3 and 4 only

D

2, 3 and 4 only

An incident ray strikes a plane mirror at an angle of incidence of 50°. What is the decrease in the angle of reflection, if the incident ray moves to angle of incidence of 30°?

A

10°

B

20°

C

30°

D

40°

Choose the correct expression of the malus law (Io is Intensity of incoming light, I is Intensity light passing through Polaroid and θ is polarizing angle):

A

\(I = \frac{{{I_0}}}{2}Co{s^2}\theta\)

B

\(I = I_0^2Cos\;\theta\)

C

\(I = \frac{{{I_0}}}{4}Co{s^2}\theta \)

D

\(I = {I_0}\;Co{s^2}\theta \)

An electromagnetic beam has an intensity 16 W/m2 and is linearly polarized vertically. What is the intensity of the transmitted beam, if the angle of incidence on the polaroid is 45° with the vertical?

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