0% found this document useful (0 votes)
35 views14 pages

Diffraction Chapter

The document discusses the phenomenon of diffraction, particularly focusing on Fresnel's diffraction and the behavior of light waves around obstacles. It covers concepts such as the formation of maxima and minima, the use of lenses to create parallel light beams, and the principles of resolving power in optical instruments. Additionally, it includes mathematical formulations for calculating positions of maxima and minima in diffraction patterns.
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF or read online on Scribd
0% found this document useful (0 votes)
35 views14 pages

Diffraction Chapter

The document discusses the phenomenon of diffraction, particularly focusing on Fresnel's diffraction and the behavior of light waves around obstacles. It covers concepts such as the formation of maxima and minima, the use of lenses to create parallel light beams, and the principles of resolving power in optical instruments. Additionally, it includes mathematical formulations for calculating positions of maxima and minima in diffraction patterns.
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF or read online on Scribd
You are on page 1/ 14
oe a [Brecon] Ga=0 yy fesnelis idigeraction/ The ype OF dtepraction jn whieh The phenomena of bending of light wave Brun the | edge of an cbsgtade is called Gite rech There ave hie dyees of di¢ermchon + @ Ereshetis dippraction @ Feunhorers — dippraction: source and Seveen ave at sinfte distance FYO™ obstacle m ---" stnOn Cc. On “(for small) e aO@, =n eam en =n classmate [ere] 4) br ast Secondary mPnima ) YaA4a lows A | ef secmday minima t- y= 2. —_+— a: rd Va. 2 2A] oe ae BX ze Lt A far nth Secondary minma:~ a —_— 7 oe Lt . On = A _| ad case ar i- | Posthm of secondary marin”: _ pe = Cnridet 7 iy dsm® = CanxDA Sf" For_s¥ma}) anole sn® Go: | de = @ntid4 | O@= cntrida I 2d —~___an_ gene's | 127A ad Wheres MA Ore 28 ees L N Pd fanen) 4 i On feoriya | TE fer pirs+ Secondary maxima GQi\= 3A ad He er_cerord secondary maxima | ae. O2= GA 2 2 Figi- Intensiry « ashi b bint cune —>sin&, ut - _ me th of cenhal Lmaxima is defined as the distance behveen errst Minima on eimer side Of Central _mascima p wsm, Lle+ tc‘be the distar [eirst minima promo: Tren | Live know Mat for First minima. | O=Ag —G + gm VE |__Aiso From Fiowve in A CPO owt i Tene = >< /@ Led p— ise A for smai_ange tTaneo@ [> - “.8= 2d) —@ a L - fom @ arc © a ! Ass, 7 3 >. rE boi i \ classmate bate Pane center maxina || aA nth mininy — Samma_tko — widhy oF Cenkal maxima = ox distance =2A0 a e urdth Of Canhal maxima is douvle tran that OF Fivs+ Seandary minima ar mexsimes | [_* antensity gees on decreasing « for first cenheal maxima | @= 8A w— ead From Oecea O= Alo. r 26 3 a ° 2d - Hy oe = BAD; aca 2 we mm mn = 3N (AD) = aT which gives me Astane of nth) maxima s Fem _cental_masdima. —B aris an avvengenent Qnsisting large nor of parallel slits ~~8F equal width and SePerated Fem Keach” Other by equal opaque portion sailed diffraction Seating a Xe the | s\tts are parallel to_exchotha! Anen the diffraction grahing is alle) Oleine hansmission Qraiting. J+ urag pivst construer Seven Pi ler us censider a Plane beansmisston i gQrxahng AG whose Wiss ave {to the +— lan Of Perey. ae Sa” be the Widty of ~— Mie SC pe ne bic kness OF opaque potion 29 . Then the distance (ayy. is ca\ed— ‘ the grahng elements. : ~ =P lap W' be tre no of lines per_uni} lenglb-— § of the grating then the auahin Jere fs aun by Gia ag oo ES . Sete a ~_ -piileb us emsider a Ravallel beam of monse! hes . * ., . Lo matic Sight igs incident on the gube rs The: Bonk dierrack N clighht iS fecused by the Lens W on the. screen 1 Ps >_ disoute | \ | to see two spechal \the as Aistinct from | eacn omer - | | + a tf | Resalving Power Cf microscape/. | Batis defined as | ine rec prea) | of the smalest distance between two point Objeck at Which they can be |_jusi reselve When een rough tne . Lye ierescope - : } | ap fa \— 2visme - | Be I : C53 D Ee i | where t I - ao= cm is the lime of eee - li awsind LL. ~ - =e ~ 7 A wavelength af Ugnk < ~~ is wis Redrachve index of the mediuin ~ ~~ enclosed btm. Obaed Rens 7 ~ B= hate angle of wne pram each pelnt abject . TT TT \ — Bar as. dedinad. cy tne veci vocal TT IMS _SMANES+ angular se ‘ swe —_alis tint ole seck | hose lumege can be gust _vesslve oy id, Re = a reas TO How wide is the central dippachion _— reals or a 5 creen 3:gem pehind = p+ --2 + 6S ‘ening Vik: s\Wuminalked by soonm hghs? Width Cx> = QAD a = 2% 500 K\T Ix 3.5 X1O7Z _ O-oa XxX Jo" 3 ~ = B+Ss xis m- © DA parallel beam of mono chrrahc light 1's ~~ allo wed +0 Ineiden*+. - nsymany OR a Plahe ha nsevsstoh grating having ‘sogt tines. |mm ~~Land -secand ovder-spechal lines-iis Found ett ao calculate. tne, Wavelengtn: of light ee haves = sine nA. -| N= Sce:(mm *s eck wed Lye SOO X 10 X\00 a singo =-2A. = sare im- Set ‘ . ow AS sxio tm ii aS | sin 8 =n cheat nN € on A > 0) A _parailes beam op Itght theident norma 7 oe Aifdragbren grating - he angle | between aSt order =p. ha an el they stde | bf tne normal ig 29% y2min Ga?u2!) » Assum. ins that wave! englh of ranks S° 893x187 uN Find no- of lines mm tn grahny t f oN: onen 20 = 29% wh RE = 29°F - T (oe mdz dsing O=247/ L | 4% 5-893x0 = dsinha-d) — - flit igh = ew 3 : ! i 5 ( DrH78s 6637 43 perm w a ] | 4 ®) || Ai diffraction» Qruhing » has“ Lod Imes per mm iL r~ t fs fluminated” - poihally by mene chem aht “| ghk of waveleingth + 660nmM — cateutabe rE ine’ gratrng spdemng i angie at whreh E | the first oder maazlma_» and the —_ k J he of diffrachin maxima obleined--~ | = oe tines /rmm = Yoo xg? lines per mebe -~ d= 600M = G00x 176M —~ Z d22 Ge? m=e IS 59 On =n Mm ~ 1 319 8) = 4x boone \ 00x10 > sr = weony LOOK 18 Hines / geenm 600 KAT Iq “a g ao! = 0-25 0° qxToF ¢ 3 Fr ne Uf menima tema Soret 2 @590 sina=l ¢ nn dsind@anaA : na dy = avait $00 XIE | =4t=_ | LT ef sodium PU an 4 p2 haw 7 wavelength OF Approximately $830 AS and _ segs A°- A Sodium lamp send tneident __plane Ware er te ai sit cE Widm Quam. A_ Seveen is lacated 20> Bom tre) elit. find me spaetng bm. on the pst maxima of two sodium. ines ag measurtcd on the Scveen- Eoxictm) . [wo spechkal (mes ah Ar ba ee Se ~__| A= 690° Ar= 585 n° = sisdexig7m = 518560410 2m aa quem = 215m | p= 2m : Fear fist mowim a For fast maxim? (amtNae_ = d © ™~L@nadD) =do 2 ee 6, = BA ®1 = 3A! ral a = 9: B84Y =o 4hits Mm { IE da or %! = 0: 4U 165M

You might also like