A beam of light *AO* is incident on a glass slab (μ = 1.54) in a direction as shown in figure. The reflected ray *OB* is passed through a Nicol prism on viewing through a Nicole prism, we find on rotating the prism that

(1) The intensity is reduced down to zero and remains zero

(2) The intensity reduces down some what and rises again

(3) There is no change in intensity

(4) The intensity gradually reduces to zero and then again increases

Concept Questions :-

Polarization of light

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In the propagation of electromagnetic waves, the angle between the direction of propagation and plane of polarisation is

(1) 0^{o}

(2) 45^{o}

(3) 90^{o}

(4) 180^{o }

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Polarization of light

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A light has amplitude *A* and the angle between analyzer and polariser is 60°. Light reflected by analyzer has amplitude

(1) $A\sqrt{2}$

(2) $A/\sqrt{2}$

(3) $\sqrt{3}A/2$

(4) *A*/2

Concept Questions :-

Polarization of light

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Light passes successively through two polarimeters 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 m*^{2}*kg*^{–1}. The second tube contains laevo rotatory solution of concentration 30*kg*/*m*^{3} and specific rotation 0.02 *radm*^{2}*kg*^{–1}. The net rotation produced is** **

(1) 15°

(2) 0°

(3) 20°

(4) 10°

Concept Questions :-

Polarization of light

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

$Given:\phantom{\rule{0ex}{0ex}}\mathrm{cos}{75}^{0}=0.26\phantom{\rule{0ex}{0ex}}\mathrm{cos}{57}^{0}=0.57\phantom{\rule{0ex}{0ex}}\mathrm{cos}{35}^{0}=0.82\phantom{\rule{0ex}{0ex}}\mathrm{cos}{15}^{0}=0.96\phantom{\rule{0ex}{0ex}}$

(1) 75°

(2) 55°

(3) 35°

(4) 15°

Concept Questions :-

Polarization of light

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

(1) 32 *Wm*^{–2}

(2) 3 *Wm*^{–2}

(3) 8 *Wm*^{–2}

(4) 4 *Wm*^{–2}

Concept Questions :-

Polarization of light

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In the visible region of the spectrum the rotation of the place of polarization is given by $\theta =a+\frac{b}{{\lambda}^{2}}$. The optical rotation produced by a particular material is found to be 30° *per mm *at $\lambda =5000$Å and 50° *per mm *at $\lambda =4000\text{\xc5}$. The value of constant *a* will be

(1) $+\frac{50\xb0}{9}$*per mm*

(2) $-\frac{50\xb0}{9}$*per mm*

(3) $+\frac{9\xb0}{50}$*per mm*

(4) $-\frac{9\xb0}{50}$*per mm*

Concept Questions :-

Polarization of light

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When an unpolarized light of intensity *I*_{0} is incident on a polarizing sheet, the intensity of the light which does not get transmitted is

(1) Zero

(2) *I*_{0}

(3) $\frac{1}{2}{I}_{0}$

(3) $\frac{1}{4}{I}_{0}$

Concept Questions :-

Polarization of light

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When the angle of incidence on a material is 60°, the reflected light is completely polarized. The velocity of the refracted ray inside the material is (in *ms*^{–1})

1. 3 × 10^{8}

2. $\left(\frac{{\displaystyle 3}}{{\displaystyle \sqrt{2}}}\right)\times {10}^{8}$

3. $\sqrt{3}\times {10}^{8}$

4. 0.5 × 10^{8}

Concept Questions :-

Polarization of light

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Two polaroids are placed in the path of unpolarized beam of intensity *I*_{0} 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

(1) $\left(\frac{{\displaystyle {I}_{0}}}{{\displaystyle 8}}\right){\mathrm{sin}}^{2}2\theta $

(2) $\left(\frac{{\displaystyle {I}_{0}}}{{\displaystyle 4}}\right){\mathrm{sin}}^{2}2\theta $

(3) $\left(\frac{{\displaystyle {I}_{0}}}{{\displaystyle 2}}\right){\mathrm{cos}}^{4}\theta $

(4) ${I}_{0}{\mathrm{cos}}^{4}\theta $

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Polarization of light

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