Myopia dan tao ho se bone haufi e ka fetoloa hore e be ea tloaelehileng ka ho sebelisa lilense tsa khalase ea mahlo dan tao lilense tsa mahloLilense tsa khalase ea mahlo li hoketsoe likhalaseng tsa mahlo, ha lilense tsa mahlo li hoketsoe ho thaka ea leihlo. Likhalase li hole ka tsela e itseng ho tloha leihlong, ha lilense tsa mahlo li hoketsoe leihlong, kahoo sebaka se pakeng tsa lense ea mahlo le leihlo ha se na thuso.
Sengoloa sena se hlalosa mehlala ea mathata a hlahelang batho ba bonang haufi le ba bonang hole, mefuta ea lilense tse sebelisoang ho lokisa pono, le bolelele le matla a lilense tsena. Sengoloa sena se shebane le tšebeliso ea likhalase ho lokisa mahlo a bonang haufi le a bonang hole.
Ho Bona Haufi le Lilense Tse Kobehileng
Ntlha e hole leihlo le bonang haufi kapa myopia ke 102 cm. E le hore leihlo le bonang haufi le bone lintho ka ho hlaka, fumana (a) mofuta oa lense e sebelisitsoeng, (b) bolelele ba lense, (c) matla kapa matla a lense.
Lilense tsa likhalase hangata li hole le mahlo ka 2 cm.
Puisano
(A) Mofuta oa lense e sebelisitsoeng
Ka sehlooho pono e haufi Ho hlalositsoe hore lilense tse sebelisetsoang ho etsa hore mahlo a haufi a be bonolo ke lilense tse kobehileng kapa lilense tse fapaneng kapa lilense tse mpe.
(B) Bolelele ba lense
E le hore ntho e bonoang ke leihlo le bonang haufi ka lense ea pono e be hole haholo, lense e tlameha ho etsa setšoantšo se hole ka 102 cm ka pel'a leihlo, e leng ntlha e hole ea leihlo le bonang haufi. Lense ea pono e hole ka 2 cm ho tloha leihlo kahoo setšoantšo se hole ka 100 cm ka pel'a lense. Setšoantšo se ka pel'a lense, ka hona setšoantšo se totobetse ebile se otlolohile (bapisa tlhaloso e sehloohong). setšoantšo sa lense e kobehileng)
Hoa tsebahala :
Sebaka (s) sa ntho = ho se fele
Sebaka sa setšoantšo (s') = -100 cm (se fosahetseng hobane setšoantšo ke sa sebele)
E botsitsoe Bolelele (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 mithara.
Bolelele bo fosahetseng ba focal bo bolela hore lense e sebelisitsoeng ke lense e kobehileng kapa lense e fapanyetsanang.
(C) Matla a lense
P = 1/f = 1/-1 m = -1 Dioptara
Matla kapa matla a lense ke -1 D. Letšoao le lebe le bolela hore lense e sebelisitsoeng ke lense e kobehileng kapa lense e khelohang.
Lilense tse haufi le tse nang le pono e bataletseng
Ntlha e haufi ea leihlo la motho ea bonang haufi ke 102 cm. E le hore motho a khone ho bala a le bohōle ba 25 cm ka pel'a leihlo, fumana (a) mofuta oa lense e sebelisitsoeng, (b) bolelele ba lense, (c) matla a lense.
Lilense tsa likhalase hangata li hole le mahlo ka 2 cm.
Puisano
(A) Mofuta oa lense e sebelisitsoeng
Ka sehlooho pono e hole Ho hlalositsoe hore lilense tse sebelisetsoang ho lokisa mahlo a haufi ke lilense tse kobehileng kapa lilense tse kopaneng kapa lilense tse ntle.
(B) Bolelele ba lense
Hore ntho e bonweng e le 25 cm ka pel'a leihlo, lense e tlameha ho etsa setšoantšo se hole ka 102 cm ka pel'a leihlo, e leng ntlha e haufi ea leihlo le bonang haufi. Lense ea khalase ea mahlo e hole ka 2 cm ho tloha leihlo, kahoo setšoantšo se tlameha ho ba 100 cm ka pel'a lense, 'me ntho e tlameha ho ba 23 cm ka pel'a lense. Setšoantšo se ka pel'a lense, kahoo setšoantšo se otlolohile ebile se bonahala ka tsela ea sebele (bapisa tlhaloso e sehloohong sena). setšoantšo sa lense e kobehileng)
Hoa tsebahala :
Sebaka (libaka) sa ntho = 23 cm
Sebaka sa setšoantšo (s') = -100 cm (se fosahetseng hobane ke sa sebele)
E botsitsoe Bolelele ba fokase (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 limithara
Bolelele bo nepahetseng ba focal bo bolela hore lense e sebediswang ke lense e kobehileng kapa lense e kopaneng kapa lense e ntle.
(C) Matla a lense
P = 1/f = 1/0,3 = +3 Dioptara
Matla kapa matla a lense ke +3 D. Letšoao le letle le bolela hore lense e sebelisitsoeng ke lense e kobehileng kapa lense e kopanang.
