MOT HirdNG TIEP CAN TRONG DAY HOC QUANG HOC (VAT LJ 7 ) NHAM PHAT HUY TJNH TJCH ClfC, SANG TAO CUA HOC SINH O PGS TS D6 H U O N G T R A " ThS NGUYEN LAM S U N G " Trong qud Hinh day hqc chuang «Quang[.]
MOT HirdNG TIEP CAN TRONG DAY HOC QUANG HOC (VAT LJ 7) NHAM PHAT HUY TJNH TJCH ClfC, SANG TAO CUA HOC SINH O PGS TS D6 H U O N G T R A " - ThS N G U Y E N L A M S U N G " rong qud Hinh day hqc chuang: «Quang khdi nlfm ngudn sdng vd vdt duqc ehllu sdng • Pha ihi} nhit: Duo HS vdo Hnh hudng ed hge" (Vdt If 71 hqe sinh (HS) gdp khd khdn hqc mft sd nfl dung nhu: kbdl nlfm vdt vdn dl sdng (ngudn sdng thii cdp), dllu klfn nhin riidy Mi/c tiSu: Ldm ndi Idn cdc quan nlfm eOa HS mft v^t, vl ede em khdng hinh dung dupe: vl v l dllu klfn nhin riidy soo mft vf t khdng phdt sdng Iqi cd riil phdn h^n G V gql Hnh hudng: Died thi nhin thiy mil dnh sdng, dnh sdng cdn dl Idl mdt ngudi quan vit, cin nhOng diiu klin ndo? sdt d l ngudi dd ed m l nhin riidy mft vdt, hpi soo HS suy nghr vd dua cdu hd\dl: Died thi dnh sdng hi vft h5i mdt riil iol nhin riidy v$t nhin thiy mil vit, dn: 1) hMt khdng bl mu (vai Bdi vilt Hinh bdy mft cdch tilp cfn mdl hd CiJa mit); 2) Phdi cd dnh sdng; 3) Mil phdi dqy hqe chuong: Quang hgc (Vdt If 7) nhdm phdt nhin vdo vdt huy Hnh Heh eye vd sdng tqo ciio HS Hong hpc tdp Da sd HS cho rdng, d l nhin tfidy vdt, vdt phdi Co sd thyc Hin duqc vnhiing' Hong dnh sdng vd mdt phdi ddi Quo riiyc Hin dqy hqc chuong: Quang hgc, dlfn vdl v f l Cung ed HS cho rdng, sd dl cd riil chiing tdi nhdn rii^: Khdi nifm ngudn sdng (so nhin rii^ cdc vft Id nhung «Ha nhin" hi mdt cdp) khdng phdi Id vd'n d l khd ddi vdl HS Hdu chl^j tel v$t N l u ehe chdn d l cdc «Ha nhin* khdng hit, ede em diu ke tdn duqc cdc ngudn sdng vd ehllu h±r| v ^ rill chung Hi khdng nhin riidy vdt cd rill bilu diln dnh sdng xudt phdt hi ngudn Nhu vdy, Hnh hudng duo cuo G V dd dl sdng so cdp (m$t Hdi, ddn dlfn) bdng mft doqn din kit qud rdng mdt cung nhu dnh sdng ddng riidng N l u gido vidn (GV) ydu cdu HS H'd Idi vol trd quon Irqng sy nhin thdy edu hdi Id dnh sdng hi ddn xudt phdt hi ddu thi • Pha thi> hai: Thi nghifm vrW «thlit bf phdt HS sd nhonh ehdng Hd \d\ rdng xuit p/id^ h> ddy hiin dnh sdng" tdc bdng din Vonfram N l u G V ydu edu HS ehl Mi/c tiiu: HS tudng tuqng ro rdng mft vft chilu md dnh sdng dd dl h^l riil ede em sd riidm khdng sinh dnh sdng cd t h i phdn h3n dnh sdng vdo ede mui tdn trdn ede dudng riidng Nhu v^y, h^lnd khdi nlf m Ho sdng duqc nhin dgng vd thi hiin Phq ndv duqc chlo thdnh hol glal doqn: - Glal mft cdch khd d l ddng Do dd, vifc GV ddnh dogn 1: Thf nghifm gid hqc Mi/c tiiu: HS nhilu riidrt gian d l gidl riiifu khdi nlfm ngudn quon sdt d l t n ^ rdng, gidy dnh «cd phdn iing" sdng so ed'p vd Ho sdng cung nhu djnh ludt Iruyin vdi dnh sdng thdng dnh sdng chuong ndy Id khdng edn GV ggi v6n S eho HS: Vl soo gidy dnh phdi riiilt md edn ddnh nhilu riidl glon eho ede hoql bqc kfn Hong d'ng nhya mdu den? D l l u gl xdy dfng dqy hqc vdl cdc Hnh hudng khde nhdm gidy dnh d l d ngodi dnh sdng? giup HS ndm duqc kiln thiic ve ngudn sdng thii Tiln trinh riif nghifm gdm cdc budc sou: cdp vd dllu klfn nhin riidy mft vdt 1) Cde tdm r ^ mdu den cOa phdng Hii nghifm Thidt k l Hnh hudng dqy hqc vdl cdc thf duqc riid xudng; 2) Tdt ddn phdng; 3) Mdl nghifm don gidn HS ddt mpt nut nhd Idn mdnh gidy dnh (duqc Mi/c tiiu: - HS bilu diln dupc dnh sdng bdng phdt hi trude); 4) Bdt sdng ddn phdng doqn riidng ed mui tdn ehi chilu Huyin dnh sdng; Ichodng 10 gidy, sau dd tdt ddn dl; 5) HS ddt cde - HS dy dodn duqc nhung vdt md mdt ihudng cd mdu gid'y dnh cOo minh vdo hol ehqu chiia hdo rill nhin rii^ (khi quan sdt Hyc flip) hong cdc Hnh hudng khde nhou, tCiy riiude vdo vj trf luong ddi *Tni»i{B9ibfcstfphaaUI(4i Clio vqt, cuo ngudn sdng vd eua mdt; hinh thdnh " TnMi{ CM dHiK »r PMB QiMS NtMh T Tap chi Blao due s6