Mafunso a Chitsanzo cha Polarization
Polarization ndi chinthu chofunikira kwambiri mu fizikisi chomwe chimafotokoza momwe mafunde a kuwala amayendera. Pokambirana za polarization, nthawi zambiri timatchula mafunde a kuwala ngati mafunde amagetsi omwe amatha kusinthasintha mbali zosiyanasiyana. Pachifukwa ichi, polarization imatanthauza momwe mafundewa amayendera. Nkhaniyi ifotokoza mozama za lingaliro la polarization ndikupereka zitsanzo zingapo za mavuto kuti timvetse bwino zomwe zili mkati mwake.
Lingaliro Loyambira la Polarization
Kugawa kwa kuwala kumachitika pamene mafunde a kuwala azungulira mbali inayake. Kawirikawiri, kuwala kooneka kumasinthasintha mbali zosiyanasiyana molunjika ku mbali yake yofalikira. Komabe, ndi kugawa kwa kuwala, tikhoza kuchepetsa njira ya kugawa kumeneku. Kugawa kwa kuwala kumatha kuchitika kudzera m'njira zingapo, monga kugawa kwa kuwala pogwiritsa ntchito kuwala, kusinthasintha kwa kuwala, komanso kugwiritsa ntchito zosefera za kuwala.
1. Kugawanitsa kwa kuwala ndi kuwala: Pamene kuwala kumawonekera kuchokera pamwamba pa dielectric, monga madzi kapena galasi, kuwala komwe kumawonekera kumatha kugawidwa pang'ono.
2. Kusinthasintha Kawiri: Zipangizo zina zamakristalo, monga calcite, zimatha kugawa kuwala kukhala ma ray awiri omwe amagawidwa mbali zina.
3. Zosefera Zogawanitsa: Zosefera zogawanitsa zimangolola kuwala kogawanika mbali imodzi kuti kudutse, kuchotsa kuwala kogawanika mbali zina.
Kuphatikiza apo, kugawa kwa magalasi kumatha kuchitika mwachilengedwe kapena mwa kupanga. M'moyo watsiku ndi tsiku, magalasi a dzuwa omwe amagwiritsa ntchito zosefera zagalasi ndi chitsanzo chodziwika bwino.
Mafunso a Chitsanzo cha Polarization
Kuti timvetse bwino za polarization, tiyeni tikambirane zitsanzo zotsatirazi:
Funso 1: Polarization ndi Polarization Fyuluta
Funso:
Ngati kuwala kopanda polarized komwe kuli ndi mphamvu yoyambirira \(I_0 \) kudutsa mu fyuluta yopolarized, kodi mphamvu ya kuwala komwe kumatuluka mu fyuluta ndi yotani?
Yankho:
Kuwala kosapyola muyeso kukadutsa mu fyuluta yopoletsa, mphamvu ya kuwala kotuluka imayendetsedwa ndi lamulo la Malus. Pa kuwala kosapyola muyeso, theka la mphamvu yoyambirira lidzadutsa mu fyulutayo.
\[
Ine = \frac{1}{2} I_0
\]
Kotero, mphamvu ya kuwala komwe kumatuluka mu fyuluta ndi theka la mphamvu yoyambirira, yomwe ndi \( 0,5 I_0 \).
Funso 2: Zosefera Ziwiri Zogawanika zokhala ndi Ma Angles ku Principal Axis
Funso:
Kodi mphamvu yomaliza ya kuwala imadutsa mu zosefera ziwiri zozungulira zomwe zimakonzedwa pa ngodya ya \( 30^\circ \) kwa wina ndi mnzake ndi yotani? Mphamvu yoyambirira ya kuwala ndi \( I_0 \).
Yankho:
Pa ma filter awiri ozungulira omwe ali ndi ngodya pakati pa ma axes awo ozungulira, mphamvu ya kuwala ikadutsa mu fyuluta yachiwiri imaperekedwa ndi fomula iyi:
\[
Ine = I_0 \cos^2 \theta
\]
Mwa kulemba mtengo \( \theta = 30^\circ \):
\[
Ine = I_0 \cos^2 30^\circ = I_0 \left(\frac{\sqrt{3}}{2}\right)^2 = I_0 \frac{3}{4}
\]
Kotero, mphamvu yomaliza ndi \( \frac{3}{4} I_0 \).
Funso 3: Kugawanika kwa Magulu mwa Kuganizira
Funso:
Kuwala kumagunda pamwamba pa madzi pa ngodya ya zochitika \( 53^\circ \). Ngati index ya refractive ya madzi ndi 1,33, dziwani ngodya ya Brewster ndikuwona ngati kuwalako kuli kogawanika bwino.
Yankho:
Ngodya ya Brewster (\( \theta_B \)) imachitika pamene kuwala kowalako kwagawika bwino ndipo kungawerengedwe pogwiritsa ntchito njira iyi:
\[
\tan \theta_B = n
\]
Kumene \( n \) ndi chizindikiro cha refractive cha sing'anga yachiwiri (pankhaniyi madzi).
\[
\tan \theta_B = 1,33 \amatanthauza \theta_B = \tan^{-1}(1,33) \pafupifupi 53^\circ
\]
Popeza ngodya ya zochitika ndi \( 53^\circ \), yomwe ndi yofanana ndi ngodya ya Brewster, kuwala komwe kumawonetsedwa kudzagawidwa bwino kwambiri.
Zokambirana
Kuchokera ku zitsanzo zitatu zomwe zili pamwambapa, titha kuwona zochitika zosiyanasiyana pomwe lingaliro la polarization limagwira ntchito. Mu vuto loyamba ndi lachiwiri, lamulo la Malus ndi ngodya pakati pa zosefera zimakhudza mphamvu ya kuwala komwe kumadutsa mu fyuluta yopondera. Mu vuto lachitatu, ngodya ya Brewster imatsimikizira momwe kuwala komwe kumawonetsedwa kumapondera bwino. Kumvetsetsa mfundo zazikuluzikulu izi ndikofunikira kuti zigwiritsidwe ntchito kwambiri mu optics ndi ukadaulo womwe umagwiritsa ntchito polarization, monga makamera, ma telescope, ndi zida zolumikizirana za fiber-optic.
Kugwiritsa Ntchito Polarization
Polarization ili ndi ntchito zosiyanasiyana zothandiza. Pojambula zithunzi, zosefera za polarizing zimathandiza kuchepetsa kuwala ndi kuwonjezera kusiyana kwa zithunzi. Pa zowonetsera za LCD, polarization imagwiritsidwa ntchito kulamulira kuwala ndi mitundu yomwe imawonetsedwa. Polarization imagwiritsidwanso ntchito poyesa kupsinjika ndi kuzindikira zinthu kudzera mu polarization spectroscopy.
Mapeto
Polarization ndi lingaliro lofunika kwambiri la kuwala, lomwe limakhudza njira yozungulira mafunde a kuwala. Kumvetsetsa polarization ndi momwe mungalamulire ndikofunikira kwambiri pakugwiritsa ntchito ukadaulo wosiyanasiyana. Kudzera mu zitsanzo zomwe zafotokozedwa, taphunzira momwe kuwala kungakhudzire mphamvu ya fyuluta yozungulira komanso momwe ngodya ya Brewster imapangira mikhalidwe yabwino kwambiri ya polarization. Pomvetsetsa mbali izi, titha kumvetsetsa bwino ntchito ya polarization muukadaulo watsiku ndi tsiku ndi sayansi.
