Lub teeb nyem siv iav li cas?

Cov txheej txheem:

Lub teeb nyem siv iav li cas?
Lub teeb nyem siv iav li cas?
Anonim

Raws li Mahesh hais rau peb, lub teeb muab tso rau ntawm daim iav tsom iavthiab tom qab ntawd cov rays uas rov qab mus thiab tsoo daim iav, DIVERGE los ntawm lub teeb (raws li ua tau pom hauv video). Yog li, yog tias qhov kev ncua deb ntawm lub teeb thiab cov khoom nce, ces lub voj voog ntawm lub teeb tseem yuav nce ntxiv.

Yuav ua li cas daim iav siv hauv lub teeb?

daim iavyog siv los ua teeb pom kev.

Vim li cas cov teeb taws siv cov iav sib txuas?

Flashlights. Concave lo ntsiab muag yog siv rau ntawm lub teeb nyem txhawm rau nthuav lub teeb uas tsim los ntawm lub teeb. Lub teeb ntog rau ntawm qhov concave ntawm lub lens, thiab cov kab hluav taws xob sib txawv ntawm sab nraud, yog li ua kom pom tseeb lub vojvoog ntawm lub teeb pom kev zoo thiab muab cov nqaj dav dua.

Vim li cas cov iav parabolic siv rau hauv lub teeb?

Parabolic reflectors yog siv los sau lub zog los ntawm qhov chaw nyob deb (xws li suab nthwv dej lossis lub hnub qub tuaj). … Hauv kev kho qhov muag, iav parabolic yog siv los sib sau ua ke lub teeb nyob rau hauv kev xav txog telescopes thiab solar furnaces, thiab project ib beam ntawm lub teeb nyob rau hauv teeb nyem, nrhiav teeb, tsom teeb theem, thiab lub teeb lub tsheb.

Vim li cas peb thiaj siv daim iav concave hauv lub tsheb taub hau thiab teeb nyem?

Concave daim iav yog siv rau hauv lub tsheb headlamp. Concave daim iav muaj lub zog sib hloov, nws tuaj yeem mloog zoo rau lub teeb ci ntawm ib qho chaw tshwj xeeb. Thiab nyob rau hmo ntuj peb xav tau cov teeb pom kev zoo ntawm lub teeb kom pom tseeb. Qhov noyog vim li cas thiaj siv daim iav concave.

Pom zoo:

Nthuav cov khoom
Puas yog homomorphism tib yam li isomorphism?
Nyeem ntxiv

Puas yog homomorphism tib yam li isomorphism?

Isomorphism yog homomorphism tshwj xeeb. Greek keeb kwm "homo" thiab "morph" ua ke txhais tau tias "zoo tib yam." Muaj ob qhov xwm txheej uas homomorphisms tshwm sim: thaum ib pab pawg yog ib pawg ntawm lwm pawg;

Yuav tau sawv los yog tshwm sim?
Nyeem ntxiv

Yuav tau sawv los yog tshwm sim?

Peb hom tshwm sim yog arise, sawv, arisen. Nws yog siv hauv cov ntsiab lus tseem ceeb: Ib lub sijhawm tshwm sim thiab nws txiav txim siab los ua txoj haujlwm hauv Brussels. Ib qho teeb meem tshwm sim nrog kuv daim ntawv hla tebchaws. Koj siv arose hauv kab lus li cas?

Nyob hauv qab ceg cov leeg nqaij gastrocnemius khoov?
Nyeem ntxiv

Nyob hauv qab ceg cov leeg nqaij gastrocnemius khoov?

Cov leeg nqaij gastrocnemius flexes ko taw ntawm pob qij txha- uas yog nws ua rau taw taw ko taw nqes los ntawm khoov nws ntawm pob taws pob taws, xws li thaum koj sawv ntawm koj. cov ntiv taw. Qhov kev txiav txim no hu ua plantar flexion. Lub gastrocnemius kuj flexes ceg ntawm lub hauv caug sib koom.