Wave Optics Tes...

A plane wave front falls on a convex lens. The emergent wave front is :

1: Primary waves can travel in all directions in an ether
2: Secondary waves can travel only in backward in an ether

Match list A and list B accurately :
List A                                       List B
a) spherical wave front            e) linear source
b) plane wave front                  f) point light source
c) cylindrical wave front          g) at infinite distance

A: In interference pattern, intensity of successive fringes due to achromatic light is not same. 

A wavefront is an imaginary surface where :

In the set up shown, the two slits $$S_{1}$$ and $$S_{2}$$ are not equidistant from the slit S. The central fringe at O is then

When petrol drops from a vehicle fall over rain water on road surface, colours are seen because of:

ASSERTION (A):Hyugens' theory failed to explain polarization
REASON (R): According to Hyugens' theory light is longitudinal wave

Polarisation of light was first successfully explained by:

Bartholinus discovered :