Sparkling short Answer Questions.
1Q. What are the reasons to belive that light is a wave motion ?
2Q. Can two wave-fronts cross one another ? Give reasons
3Q. When monochromatic light travels from one medium to another then what happens.
4Q. State the essential conditions for two light waves to be coherent.
5Q. State the essential conditions to obtain sustained type of interference of light.
6Q. Two independent light sources cannot act as cohrent sources. Why ?
7Q. If the separation between the two slits is decreased in young double slit experiment
keeping the screen position fixed,what will happen to the fringe width?
8Q. How does the fringe width ,in Y D S experiment,change when the distance of separation
between the slits and screen is doubled ?
9Q. In Y D S E if the distance between two slits is halved and distance between the two slits and
screen is doubled,then what will be the affect on fringe width?
10Q. Two identical coherent waves,each of intensity Iare producing an interference pattern. Write
resultant intensity at a point 1) constructive and 2) destructive interference.
11Q. In YDSE lights of green ,yellow and orange are successively used.Write the fringe width in
increasing order.
12Q. In YDSE , if apparatus is immersed in water ,what will be effect on fringe?
13Q. State the condition for diffraction of light.
14Q. Diffraction is common in sound but not common in light waves ? Why?
15Q. Why does the intensity of secondary maximum less as compared to the central maximum ?
16Q. What is the basic difference between interference and diffraction of light ?
17Q. A single slit diffraction pattern is completely immersed in water ,how is the width of central
maximum affected ?
18Q. If yellow light is replaced by X-rays.how will the diffraction affected in single slit diffraction
experiment ?
19Q. Which special characteristic of light is demonstrated by polarization.
20Q. Light waves can be polarised while sound waves(longitudinal wave) cannot.Why ?
21Q. What is polarizing angle?
22Q. What is Brewster law ?
23Q. Does the value of polarizing angle depend on color of light ?
24Q. What is the angle of polarization, if 1) R.I =1.732 (2) angle of refraction (3) angle of polarizat
- ion if slab is immersed into liquid of R.I =1.34 (4) if critical angle 45 degg.
25Q. Write two simple uses of polaroids.
26Q. Define,wavefront,wavelets,types of wave fronts and Huygen principle.
