Wave Optics- 2

Question 1

what is meant by intefreferece

Answer 1

Interference is the phenomenon of redistrubution of light energy in a medium on account of superposition of light waves from 2 coherent sources.

the points where the rsultant intensity of light is maximum is called construvtive interference

the pts where the rsultant intensity is minimum is called destructive intetference

Question 2

what are coherent sources

Answer 2

2 sources of light that continuously emit light of the same wavelength, same frequency with 0 or constant phase difference b/w the 2 is called coherent waves.

Question 3

2 independent sources cannot be coheren.

Answer 3

This is because light is emitted from individual atoms of the source, when they return to the ground state after being excited by heat or electric discharge.

Since even the smallest source has billions of atoms which cannot emit light in the same phase.

Question 4

how are coherent sources obtained

Answer 4

coherent sources of light can be obtained from a single light source by using refraction of reflection.

This is because all random phase changes in the parent source are repeated in the image source so the relative phase difference remain constant at all times.

Question 5

conditions of wave fromation

Answer 5

i) coherent source of light must beobtinaed from a single source using rfraction or relection

ii)the light must be monochromatic( single wavelgnth)

iii) Path difference b/w light waves should be small