Ukubuka eduze nokubona kude - izinkinga nezixazululo
1. Ingane engakwazi ukubona kahle ingafunda incwadi cishe ngemitha eli-1. Ukuze ifunde ibanga elijwayelekile lokufunda elingama-25 cm, nquma ukuthi ingane kufanele isebenzise amandla ngelensi.
Isixazululo:
Ingane inenkinga yokubona kude , lapho iphuzu eliseduze lamehlo ayo liyimitha eli-1 noma i-100 cm. Iphuzu eliseduze leso elivamile liyi-25 cm. Iso lingalungiswa libe ngokwejwayelekile ngelensi egobile.
Kwaziwa:
Iphuzu eliseduze = ibanga lesithombe (s') = -100 cm
Isithunzi kumele sibe phambi kwelensi eqondile ukuze sibonakale. Ngenxa yokuthi isithunzi siphambi kwelensi eqondile, isithombe sibonakala singokoqobo futhi sisayinwe singesihle.
Ibanga lokufunda elijwayelekile = ibanga lezinto = 25 cm
Okufunwayo : Amandla eLensi
Isixazululo:
Ubude obuqondile belensi eqondile (f):
1/f = 1/s + 1/s' = 1/25 – 1/100 = 4/100 – 1/100 = 3/100
f = 100/3 cm
f = (100/3 : 100) m
f = (100/3 x 1/100) m
f = 1/3 m
Amandla ngelensi e-convex (P):
P = 1 /f = 1 : 1/3 = 1 x 3/1 = 3 Ama-Diopters.
Amandla e-lens convex angama-diopters amathathu.
[irp]
2.
Ngokusekelwe esithombeni esingenhla, thola ukuthi isiphi isiphako samehlo esisetshenziselwa ukwenza iso libe ngcono.
Isixazululo
Izinkinga zamehlo: ukubona kude
Ukukhanya kungagxila ngqo ku-retina uma ilensi egobile ibekwe phambi kweso. Amalensi ahlukene asiza ekusakazeni ukukhanya ukuze kugxile ngqo ku-retina.
[irp]
3. Umuntu angafunda ebangeni eliseduze kakhulu lama - 50 cm. Ukuze akwazi ukufunda ebangeni elingama-30 cm, thola amandla ngelensi yezibuko zamehlo.
Isixazululo:
Umuntu unesifo sokubona eduze , amalensi asetshenziselwa ukulungisa amehlo aseduze amalensi aqondile noma amalensi ahlanganayo noma amalensi amahle.
Ukuze into ebonwayo ibe ngamasentimitha angu-30 phambi kweso, ilensi kufanele yakhe isithombe ebangeni elingamasentimitha angu-50 phambi kweso. Isithombe siphambi kwelinsi ukuze isithombe siqonde futhi sibonakale.
Kwaziwa:
Ibanga (ama) lento = 30 cm
Ibanga (s') lesithombe = -50 cm ( elibi ngoba liyi-virtual )
Okufunwayo: Amandla ngelensi (P)
Isixazululo:
Ubude be-focal:
1/f = 1/s + 1/s'
1/f = 1/30 + 1/-50
1/f = 5/150 – 3/150
1/f = 2/150
f = 150/2 = 75 cm = 0.75 amamitha = 75/100 amamitha s
I-focal length esayinwe kahle isho ukuthi ilensi esetshenzisiwe ilensi eqondile.
Amandla e-lens:
P = 1/f
P = 1 : 75/100 = 1 x 100/75
P = 100/75
P = 4/3 ama -Diopters
