64 m kj izns'k jktf"kZ V.Mu eqDr fo'ofo|ky;] bykgkckn

8
525
m kj izns’k jktf"kZ V.Mu eqDr fo’ofo|ky;] bykgkckn
vf/kU;kl (Assignment) 2012-2013
Lukrd foKku dk;Z e …ch-,l-lh-‰
Bachelor of Science Programme (B.Sc.)
fo"k; % HkkSfrd foKku fo"k; dksM % ;w-th-ih-,p-,l-
Subject : Physics Subject Code : UGPHS
dkslZ ’kh"kZd % dkslZ dksM % ;w-th-ih-,p-,l--07
Subject Title : Optics
Course Code : UGPHS-07
Section - A
[k.M & v
vf/kdre vad % 30
Maximum Marks : 30
vf/kdre vad % 18
Maximum Marks : 18
uksV % nhkZ m kjh; iz’uA vius iz’uksa ds m kj 800 ls 1000 ’kCnksa esa fy[ksaA lHkh
iz’u vfuok;Z gSaA
Note : Long Answer Question. Answer should be given in 800 to 1000 words.
Answer all questions. All questions are compulsory.
1. Define cardinal points in a lens system. Derive an expression for the
focal length of a lens combination of two co-axial thin leaves separated
by a distance. 6
,d ysUl fudk; esa iz/kku fcUnqvksa dh ifjHkk"kk nhft,A dqN nwjh ij j[ks
nks ,d v{kh; irys ysUlksa ds Qksdl nwjh ds fy, O;atd Kkr dhft,A
2. Describe Newton's ring method to determine the warelength of
monochromatic light. How will you use this experiment to measure the
refractive index of a liquid 6
,d o.khZ; izdk’k dh rjax nSgS;Z Kkr djus gsrq U;wVu fjax fof/k dk o.kZu
dhft,A vki bl iz;ksx }kjk nzo dk viorZu lwpdkad dSls Kkr djsaxsA
3. Discuss Raybeigh's criterion for the limit of resolution. Derive the
expression for resolving power for a prism. 6
foHksn lhek dks jSys dlkSVh dh foospuk dhft,] fizTe ds fy, foHksnu
{kerk lw=k dh O;qRif k dhft,A
Section - B
[k.M & c
vf/kdre vad % 12
Maximum Marks : 12
uksV % ykq m kjh; iz’uA vius iz’uksa ds m kj 200 ls 300 ’kCnksa esa fy[ksaA lHkh
iz’u vfuok;Z gSaA
Note : Short Answer Question. Answer should be given in 200 to 300 words.
Answer all questions. All questions are compulsory.
4. Obtain Intensity distribution for fraunhoffer for diffraction at a single
slit. 3
fdlh ,dy js[kkfp=k ij kmugksij foorZu esa rhozrk dk forj.k Qyu
fudkfy;sA
5. Give the theory of Rownald circle for concave grating. Explain how
normal spectrum is obtained in Rownald wounting. 3
vory xzsfVax ds fy, jkSySaM o‘ k dk fl)kUr nhft,A Li"V dhft, fd
jksySaM ekbfUVax ea ukeZy LisDV“e dSls izkIr gksrk gSA
6. Describe the construction of a Nicol prism and explain how it can be
used as polarizer and analyser. 3
fudky fizTe dh jpuk dh O;k[;k dhft, rFkk le.kb, dh bldk /kzqod
,oa fo’ys"kd dh rjg dSls iz;ksx fd;k tkrk gSA
7. What is population inversion. Draw schematic energy level diagram
and explasin laser action in He - Ne laser. 3
tula[;k foyksiu D;k gSA O;nfLFkr ¯tkZ Lrj fp=kakdu djds He-Ne
Laser (yslj) esa f ;k le>kb,A
¾¾¾¾¾¾