B.Sc Chemistry Internal 3

A plate which produces a path difference of 𝜆/2 between the ordinary and extraordinary waves is called

• Pile of plates 

• halfwave plate

• quarter wave plate

• compensator

Phase difference introduced by a quarter wave plate is 

• 𝜋/2

•   𝜋 

• 2𝜋  

•   𝜋/4

Which of the following is a negative uniaxial crystal?

•  Quartz 

• Calcite 

• Sugar

•   nickel

The direction along which all light waves travel with the same velocity is known as

• O axis  

• E axis   

• Optic axis   

•  polar axis

Polarizing angle for glass is

 

• 32.5

• 57.5

• 107

• 102.5

Brewster law is given by the relation

• tan𝜃=n 

• tan𝜃=1/n  

• Sin𝜃=n  

• Cos𝜃=n

Malu”s law gives

     

• I𝛼Cos𝜃

• I𝛼Cos2𝜃

• I𝛼tan𝜃

• I𝛼Sin2𝜃

The property of rotating the plane of vibration by certain crystals is known as 

• Optical activity  

• polarization   

• retardation

•   dichroism

The principle of light propagation in a fiber is

• Polarization 

• optical activity  

• refraction

•   total internal reflection

Sine of the acceptance angle of a fiber  is defined as 

• Numerical aperture  

• acceptance cone 

• TIR  

• V number