DOUBLE REFRACTION AND OPTICAL ACTIVITY

In elliptically polarised light

• amplitude of vibrations changes in magnitude and direction both

• amplitude of vibrations changes only in magnitude

• amplitude of vibrations changes only in direction

• no change in amplitude

Optically active substances are these which

• cause double refraction

• rotate the plane of polarisation

• polarise light

• scatter light

Doubly refracting calcite crystal is placed over an ink dot. On seeing through the crystal, one observes.

• both dots rotating about a comman axis

• two stationary dots

• one dot rotating about the other

• a single dot

In double refraction, two refracted rays are produced, called as O-ray and E-ray. Which of the following statements is TRUE

• only O-ray is polarised

• only E-ray is polarised

• both O-ray and E-ray are polarised

• neither E-ray nor O-ray are polarised

Polarimeter is a device used for

• measurement of optical rotation

• measurement of angle of polarisation

• measurement of angle of reflection

• measurement of angle of refraction

In the Nicol Prism experiment, the calcite crystal length is x times its breadth. What is x?

• 2

• 3

• 1/2

• 1/3

The working of Nicole prism is based on the phenomenon of .................

• Refraction

• Reflection

• Diffraction

• Double Refraction

If the phase difference between two rays is π/2 and the angle of incidence is equal to π/4, the emergent light is

• Linearly Polarized

• Elliptically Polarized

• Circularly Polarized

• Non-Polarized

What should be the thickness of quarter-wave plate for a light of wavelength 5000 Å if µe = 1.553 and µo = 1.544?

• 1.38 X 10^-3 cm

• 1.43 X 10^-3 cm

• 1.53 X 10^-3 cm

• 1.63 X 10^-3 cm

For E-ray, the Canada balsam layer is optically rarer.

• True

• False