Myopia dhani kuona zviri pedyo zvinogona kugadziriswa uchishandisa magirazi egirazi dhani magirazi ekuonanaMagirazi emaziso anonamirwa pamagirazi emaziso, ukuwo magirazi ekuonana anonamirwa pamboni yeziso. Magirazi ari kure neziso, ukuwo magirazi ekuonana anonamirwa paziso, saka daro riri pakati pemagirazi ekuonana neziso harina kunyanya kukosha.
Chinyorwa chino chinotsanangura mienzaniso yematambudziko anosangana nevanhu vanoona zviri pedyo nekuona zviri kure, mhando dzemagirazi anoshandiswa kugadzirisa kuona, uye urefu hwemagirazi aya. Chinyorwa chino chinotarisa pakushandiswa kwe kacamata mukugadzirisa maziso anoona zviri pedyo neanoona zviri kure.
Kuona Nearbone uye Concave Lenses
Nzvimbo iri kure Ziso rinoona zviri pedyo kana kuti myopia rinoreba masendimita 102. Kuti ziso rinoona zviri pedyo rione zvinhu zviri kure zvakajeka, sarudza (a) rudzi rwelenzi rinoshandiswa, (b) kureba kwelenzi, (c) simba kana simba relenzi.
Magirazi egirazi anowanzo kuve 2 cm kubva kumaziso.
Kukurukurirana
(A) Rudzi rwelenzi rinoshandiswa
Pamusoro penyaya kuona zviri pedyo Zvakatsanangurwa kuti magirazi anoshandiswa kugadzirisa maziso anoona zviri pedyo ndiwo magirazi akakombama kana magirazi akasiyana-siyana kana magirazi asina kunaka.
(B) Kureba kwegirazi
Kuti chinhu chinoonekwa neziso risingaonekwe nemaziso kuburikidza negirazi rekuona chive kure zvachose, iro rinofanirwa kugadzira mufananidzo uri kure ne102 cm pamberi peziso, inova nzvimbo iri kure yeziso risingaonekwe nemaziso. Iri girazi rekuona riri 2 cm kubva kuziso saka mufananidzo uri 100 cm pamberi pegirazi. Mufananidzo uri pamberi pegirazi, saka mufananidzo wacho uri chaiwo uye wakatwasuka (enzanisa tsananguro iri munyaya yacho). mufananidzo we lenzi yakakombama)
Zvinozivikanwa :
Kureba kwechinhu (s) = kusaguma
Daro remufananidzo (s') = -100 cm (negative nekuti mufananidzo wacho uri wepaindaneti)
Akabvunzwa Kureba (f)
Jawab :
1/f = 1/s + 1/s'
1/f = 1/~ + (- 1/100)
1/f = 0 – 1/100
1/f = – 1/100
f = – 100/1 cm = -100 cm = -1 mita.
Kureba kwefocal negative zvinoreva kuti lenzi inoshandiswa ndiyo lenzi yakakombama kana lenzi inochinja-chinja.
(C) Simba regirazi
P = 1/f = 1/-1 m = -1 Diopta
Simba regirazi iri -1 D. Chiratidzo chekusaratidza chinoreva kuti girazi rinoshandiswa igirazi rakakombama kana kuti girazi rinopatsanurana.
Kuona Nearbone uye Convex Lenses
Nzvimbo iri pedyo neziso remunhu anoona zviri pedyo i102 cm. Kuti munhu akwanise kuverenga ari kure ne25 cm pamberi peziso, sarudza (a) rudzi rwelenzi rinoshandiswa, (b) kureba kwelenzi, (c) simba relenzi.
Magirazi egirazi anowanzo kuve 2 cm kubva kumaziso.
Kukurukurirana
(A) Rudzi rwelenzi rinoshandiswa
Pamusoro penyaya kuona zviri kure Zvakatsanangurwa kuti magirazi anoshandiswa kugadzirisa maziso anoona zviri pedyo ndiwo magirazi akajeka kana kuti magirazi anotenderera kana magirazi akanaka.
(B) Kureba kwegirazi
Kuti chinhu chionekwe chiri 25 cm pamberi peziso, lenzi inofanira kuumba mufananidzo uri kure ne102 cm pamberi peziso, inova nzvimbo iri pedyo neziso risingaonekwe. Lenzi yegirazi iri 2 cm kubva paziso, saka mufananidzo unofanirwa kunge uri 100 cm pamberi pelenzi, uye chinhu chinofanira kunge chiri 23 cm pamberi pelenzi. Mufananidzo uri pamberi pelenzi, saka mufananidzo wakamira uye uri chaiwo (enzanisa tsananguro iri munyaya yacho). mufananidzo wegirazi re convex)
Zvinozivikanwa :
Kureba kwechinhu = 23 cm
Daro remufananidzo (s') = -100 cm (negative nekuti iri paindaneti)
Akabvunzwa Kureba kwefocal (f)
Jawab :
1/f = 1/s + 1/s'
1/f = 1/23 + 1/-100
1/f = 1/23 – 1/100
1/f = 100/2300 – 23/2300
1/f = 77/2300
f = 2300/77 = 30 cm = 0,3 mamita
Kureba kwe "positive focal" zvinoreva kuti lenzi inoshandiswa i "convex lens" kana kuti "convergent lens" kana kuti "positive lens".
(C) Simba regirazi
P = 1/f = 1/0,3 = +3 Diopters
Simba regirazi iri +3 D. Chiratidzo chakanaka chinoreva kuti iro rinoshandiswa ndiro lenzi ine convex kana lenzi inoungana.
