1. Into enobude obuziisentimitha ezi-5 ibekwe kwi-15 cm ukusuka kwilensi edibanisa ubude obuziisentimitha ezingama-30 . Misela umgama womfanekiso , ukwandiswa komfanekiso, ukuphakama komfanekiso, kunye neempawu zomfanekiso.
Yaziwa:
Ubude befocal (f) = -30 cm
Uphawu lwe-minus lubonisa ukuba indawo egxile kuyo ikwi-virtual okanye imisebe ayidluli kwi-point.
Ukuphakama kwento (h o ) = 5 cm
Umgama wento (do o ) = 15 cm
Okufunekayo: Umgama womfanekiso (d i ), ukwandiswa komfanekiso (m), ukuphakama komfanekiso (h i ) kunye neempawu zomfanekiso.
Isisombululo:
Ukwenziwa komfanekiso ngelensi eguqukayo:
Umgama womfanekiso (d i ):
1/d i = 1/f – 1/d o = -1/30 – 1/15 = -1/30 – 2/30 = -3/30
d i = -30/3 = -10 cm
Uphawu lwe-minus lubonisa ukuba umfanekiso ungowokwenyani okanye imitha ayidluli kumfanekiso.
Ukwandiswa komfanekiso (m):
m = – di i / do o = -(-10)/15 = 10/15 = 2/3
Uphawu lokudibanisa lubonisa ukuba umfanekiso uthe nkqo.
Umfanekiso mncinci nge-2/3 kunento leyo.
Ukuphakama komfanekiso (h i ):
m = h i / h o
h i = mh o = (2/3)5 = 10/3 = 3.3 cm
Uphawu lokudibanisa lubonisa ukuba umfanekiso uthe nkqo.
Iimpawu zomfanekiso:
Iimpawu zomfanekiso owenziwe sisipili esitshintshayo:
– ebonakalayo
- ngokuthe tye
– umfanekiso mncinci kunento leyo
– umgama womfanekiso mncinci kunomgama wento
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2. Into enobude obuziisentimitha ezili-10 ibekwa kwi-60 cm ukusuka kwilensi edibanisa ubude obuziisentimitha ezingama-30. Misela umgama womfanekiso, ukwandiswa komfanekiso, ukuphakama komfanekiso, kunye neempawu zomfanekiso.
Yaziwa:
Ubude befocal (f) = -30 cm
Uphawu lwe-minus lubonisa ukuba indawo egxile kuyo ikwi-virtual okanye imisebe ayidluli kwi-point.
Ukuphakama kwento (h) = 10 cm
Umgama wento (do o ) = 60 cm
Okufunwayo: Umgama womfanekiso (d i ), ukwandiswa komfanekiso (m), ukuphakama komfanekiso (h i ) kunye neempawu zomfanekiso
Isisombululo:
Ukwenziwa komfanekiso ngelensi eguqukayo:
Umgama womfanekiso (d i ):
1/d i = 1/f – 1/d o = -1/30 – 1/60 = -2/60 – 1/60 = -3/60
d i = -60/3 = -20 cm
Uphawu lwe-minus lubonisa ukuba umfanekiso ungowokwenyani okanye imitha ayidluli kumfanekiso.
Ukwandiswa komfanekiso (m):
m = -d i /do o = -(-20)/60 = 20/60 = 1/3
Uphawu lokudibanisa lubonisa ukuba umfanekiso uthe nkqo.
Umfanekiso mncinci nge-1/3 kunento leyo.
Ukuphakama komfanekiso (h i ):
m = h i / h o
h i = mh o = (1/3)10 = 10/3 = 3.3 cm
Uphawu lokudibanisa lubonisa ukuba umfanekiso uthe nkqo.
Iimpawu zomfanekiso
– i-virtual kuba imisebe ayidluli kumfanekiso
- ngokuthe tye
– umfanekiso mncinci kunento leyo
– umgama womfanekiso mncinci kunomgama wento
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