Thursday, September 15, 2011

Optics - TRB Physics Study Materials

Find the Fundamental and Concept orientated TRB physics questions in Optics.


SI NO.
QUESTIONS
ANSWERS
1.        
The point on the principal axis through which all rays will pass un deviated?
Optical centre
2.        
The planes passing through the principal axis are called?
Principal plane
3.        
For blue color refractive index is?
More
4.        
The reciprocal of dispersive power is called?
Contingence
5.        
Interference was first observed by?
Thomas young
6.        
The color forms in the soap bubble is due to ?
Interference
7.        
In young’s double slit experiment the width of each slit is about?
0.03mm
8.        
An important application of interference in thin film is?
Newton’s ring
9.        
The bending of waves around the edges of an obstacle is called?
Diffraction
10.    
The easiest pattern observed by the spectrometer is?
Fraunhofer
11.    
Points on successive slits separated by a distance equal to the grating element are called?
Corresponding points
12.    
Diffraction phenomenon can be classified by ?
Fresnel diffraction and Fraunhofer diffraction
13.    
The modern commercial form of grating contains about?
6000 lines/cm
14.    
A wave having oscillations in all directions is called?
Un polarized
15.    
The angle of incidence at which the reflected beam is completely polarized is called?
Polarizing angle
16.    
The plane in which vibrations occur at right angles to the plane of polarization is called?
Plane of vibration
17.    
Intensity of polarized light can be explained by?
Maulus
   19.
A device which examines whether the light is plane polarized or not?
Analyzer
   20.
A ray of un polarized light is incident on a calcite crystal two refracted rays produced, this is called?
Double refraction
   21
Ordinary rays obeys laws of?
Refraction
   22
The term specific rotation is used to compare the ?
Rotation effect
23
For sodium light refractive index for ordinary light is?
1.658
24
Three-dimensional moving pictures are made by?
Polaroid film
   25
The plane of polarization in the anticlockwise direction towards source is called?
Laevorotatory