ʻIke kokoke a me ka ʻike mamao - nā pilikia a me nā hoʻonā
1. Hiki i ke keiki me ka ʻike pepeiao ʻole ke heluhelu i kahi puke ma kahi kokoke i 1 mika. I mea e heluhelu ai ma kahi mamao heluhelu maʻamau o 25 kenimika, e hoʻoholo i ka mana o ka lens e pono ai ke keiki e hoʻohana.
Lōlā:
Ua pilikia ke keiki i ka ʻike mamao , kahi i kokoke ai kona mau maka he 1 mika a i ʻole 100 kenimika. ʻO ke kokoke o ka maka maʻamau he 25 kenimika. Hiki ke hoʻololi i ka maka me kahi aniani convex.
ʻIke ʻia:
Kiko kokoke = ka mamao o ke kiʻi (s') = -100 kenimika
Pono ke aka i mua o ka aniani convex i ʻike ʻia. No ka mea aia ke aka i mua o ka aniani convex a laila he virtual ke kiʻi a ua kau inoa ʻia he maikaʻi ʻole.
Ka mamao heluhelu maʻamau = ka mamao o ka mea (s) = 25 kenimika
Makemake ʻia : Mana o ke aniani
Lōlā:
ʻO ka lōʻihi o ke kikowaena o ka lens convex (f):
1/f = 1/s + 1/s' = 1/25 – 1/100 = 4/100 – 1/100 = 3/100
f = 100/3 kenimika
f = (100/3 : 100) mika
f = (100/3 x 1/100) m
f = 1/3 m
Ka mana o ke aniani convex (P):
P = 1 /f = 1 : 1/3 = 1 x 3/1 = 3 Diopters.
ʻO ka mana o ke aniani convex he 3 diopters.
ʻAʻole maopopo
2.
Ma muli o ke kiʻi ma luna, e hoʻoholo i ke kīnā o ka maka i hoʻohana ʻia e hoʻomaʻamaʻa i ka maka.
pāʻoihana
Nā kīnā o ka maka: ʻike mamao
Hiki ke hoʻopili pololei ʻia ke kukuna mālamalama ma ka retina ke kau ʻia kahi aniani concave i mua o ka maka. Kōkua nā aniani divergent i ka hoʻolaha ʻana i ke kukuna o ke kukui i hiki ke hoʻopili pololei ʻia ma ka retina.
ʻAʻole maopopo
3. Hiki i kekahi ke heluhelu ma kahi kokoke loa o 50 kenimika. I mea e heluhelu ai ʻo ia ma kahi mamao o 30 kenimika, e hoʻoholo i ka mana o ke aniani maka aniani.
Lōlā:
Ke ʻeha nei ke kanaka i ka ʻike kokoke , ʻo nā aniani i hoʻohana ʻia e hoʻomaʻamaʻa i nā maka ʻike kokoke he mau aniani convex a i ʻole nā lens converging a i ʻole nā lens maikaʻi.
I mea e kū ai ka mea i nānā ʻia he 30 kenimika i mua o ka maka, pono ke aniani e hana i kiʻi ma kahi mamao o 50 kenimika i mua o ka maka. Aia ke kiʻi i mua o ka aniani i kū pololei a maoli ke kiʻi.
ʻIke ʻia:
Ka mamao o ka mea (s) = 30 kenimika
Ka mamao o ke kiʻi (s') = -50 kenimika ( maikaʻi ʻole no ka mea he virtual )
Makemake ʻia: Mana o ke aniani (P)
Lōlā:
Ka lōʻihi kiko:
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 kenimika = 0.75 mika = 75/100 mika s
ʻO ka lōʻihi o ke kiko i hōʻailona ʻia he maikaʻi ʻo ia hoʻi ka lens i hoʻohana ʻia he lens convex.
Mana o ke aniani:
P = 1/f
P = 1 : 75/100 = 1 x 100/75
P = 100/75
P = 4/3 Diopters
