Fisa medicina de familie.HTA.Osteoartroza.DZ tip 2 subcompensat
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FIȘĂ DE LUCRU Reflexia si refractia luminii
1) Indicele Indicele de refrac refracție al unui mediu mediu omoge omogenn și izotro izotropp poate poate fi fi exprim exprimat at cu relația: a) n!"c# $) nc"!# c) n ! c# %) Lumina Lumina se propag& propag& din aer aer 'n sticl&( Reprez Reprezenta entarea rea corect& corect& a mersului mersului razelor razelor de lumin& este: aer
aer
a)
# $) sticl&
aer
# c) sticl&
sticl&
) Imaginea Imaginea unui unui peste situat situat pe fundul fundul apei* apei* !azut !azut de un pescar* pescar* este: este: a) real $) !irtual& c)mai mare decat in realitate d) mai mica decat in realitate +) In figurile figurile urmatoare urmatoare am trasat trasat mersul mersul razelor razelor de lumina lumina intr,o lama lama de sticla cu o anumita grosime( Care desen este corectaer
aer n
n
aer
aer
Corecta Corectați repreze reprezent&ri nt&rile le gre greșite( .ustifica .ustificati/ ti/
0) Dac& Dac& o oglin oglind& d& plan& plan& se rote rotește cu ung ungiu iull 2* raza raza refle reflecta ctat& t& se rote rote ște cu: cu: a) 34 # $) 2 # c) %2
5) Un copil copil pri!e pri!ește normal normal o piatr& piatr& aflat& aflat& pe fundul fundul unui unui lac și o !ede la ad6nc ad6ncimea imea 1*% m( 7n realitate* piatra se afla la ad6ncimea: a) 3*8m # $) 1*%m # c) 1*+m # d) 1*5m
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Fisa de activitate experimentala Reflexia totala
Theory
ur $rains assume tat te ligt from te o$;ects tra!els in a straigt pat to our ee can $e fooled $< refraction and total internal reflection $ecause an o$;ect appears in a certain place?or does not appear at all?onl< $ecause te ligt raen pond* ere te roc@ appears to $e( But , that is not where the rock actually is.
Fig
If ere farter off to te side of te roc@ so tat ere at a great enoug angle to it*
>ould not see te roc@ at all $ecause of total internal reflection(
Fig
Material
penn< >ater # Buarter # large* clear drin@ing glass Procedure 1. et te Buarter on te ta$le( 2. et a large clear glass on top of te coin( $ser!e te coin troug te side of te
glass( Is te coin !isi$le3. ile atc te coin troug te side of te glass* fill te glass >it >ater( at appens to te image of te coin4. Loo@ o!er te top of te glass( Do not loo@ at te actual coin* >ic sould no> $e !isi$le troug te $ottom of te glass( Instead* loo@ at te opposite* interior side of te glass( Record at from te side and from te top of te clear glass >en it >as filled >it >ater( =r< to dra> a diagram to explain >at ( 9int: =e glass,air $oundar< is important ere ( =e speed of ligt is fastest in air* muc slo>er in >ater* and slo>est in glass( Refraction also pla
figura
What’s Going On
=e coin is clearl< !isi$le troug te side of te emptere it actuall< lies?despite refraction at air,glass and glassair $oundaries 9see figure)( =ere is air $ot inside and outside te glass* so te ligt is $ent first to>ard te perpendicular and ten a>a< from it( ince te glass is so tin?and tis occurs $ot at te $ottom of te glass and at te side?te ligt is onl< sligtl< de!iated from its original pat* and
Fig
=e coin disappears >en te glass is filled >it >ater 9see figure)( =e ligt raater are first refracted at te >ater,glass 9fasterto, slo>er) $oundar<( Ht te glass,air 9slo>er,to,faster) $oundar< on te side of te glass* total internal reflection ta@es place( =us* no ligt from te coin reaces
Fig
Seeing Multiples
Loo@ing o!er te top of te glass* ere totall< reflected at te glass,air $oundar< on te opposite side of te glass and ten refracted to>ard te eater,air $oundar<( Hn image of te coin >as terefore !isi$le( =e coin is !isi$le from te top of te glass 9pat 1)( Hn image of te coin in te opposite side is also !isi$le $ecause of te effects of refraction and total internal reflection 9pat %)(
fig
Connections
en a ligt ra< stri@es a slo>er,to,faster $oundar< at an angle to te perpendicular greater tan a certain !alue 9for >ater to air a$out +8 degrees)* instead of normal refraction* a related optic penomenon occurs: total internal reflection. =e ligt ra< is completel< reflected off te $oundar< * and none of te ligt passes troug( In tis procedure*