1. Ka whakatakotoria tētahi mea 2 mm te teitei ki te 10 cm mai i tētahi karāhe whakanui . Tata ki te pūwāhi N = 25 cm. Tātaihia te whakanui koki me te teitei o te ahua.
Mōhiotia:
Teitei o te mea (h o ) = 2 mm
Pūwāhi tata (N) = 25 cm
Te tawhiti o te mea (d o ) = 10 cm
E hiahiatia ana: Te whakanui koki (M) me te teitei o te ahua (h i )
Rongoā:
M = N / s
M = 25 henimita / 10 henimita
M = 2.5
Ko te teitei o te ahua = 2.5 x 2 mm = 5 mm.
2. Ka whakamahia he karāhe arotahi 25 cm te roa hei karāhe whakanui. Whakatauhia (a) te whakanui koki ina arotahi te kanohi ki tōna pūwāhi tata N = 25 cm (b) te whakanui koki ina okioki te kanohi.
Mōhiotia:
Pūwāhi tata (N) = 25 cm
Ko te roa arotahi o te karāhe whakanui (f) = 25 cm
Ko te tohu tāpiri e tohu ana he karāhe arotahi hūnuku te karāhe arotahi.
Rongoā:
(a) te whakanui koki ina arotahi te kanohi ki tōna pūwāhi tata N = 25 cm
M = (N/f) + 1
M = (25 henimita / 25 henimita) + 1
M = 1 + 1
M = 2 X
Mena he 1 henemita te teitei o te mea, ko te teitei o te ahua he 2 x 1 henemita = 2 henemita.
(b) te whakanui koki ina whakangāwari te kanohi
M = N / f
M = (25 henimita / 25 henimita)
M = 1 X
Mena he 1 henemita te teitei o te mea, ko te teitei o te ahua he 1 x 1 henemita = 1 henemita.
3. Ka whakatakotoria tētahi mea 1 cm te teitei ki mua i tētahi karāhe arotahi 10 cm te roa. Tātaihia (a) te teitei o te ahua ina arotahi te kanohi ki tōna pūwāhi tata N = 25 cm (b) Te teitei o te ahua ina whakangā te kanohi.
Mōhiotia:
Ko te teitei o te mea (h o ) = 1 cm
Ko te roa o te arotahi (f) = 10 cm
Pūwāhi tata (N) = 25 cm
Rongoā:
(a) Ko te teitei o te ahua ina arotahi te kanohi ki tōna pūwāhi tata N = 25 cm
M = (N/f) + 1
M = (25 henimita / 10 henimita) + 1
M = 2.5 + 1
M = 3.5 X
Mena he 1 henemita te teitei o te mea, ko te teitei o te ahua he 3.5 x 1 henemita = 3.5 henemita.
(b) Te teitei o te ahua ina whakangā te kanohi.
M = N/f
M = 25 henimita / 10 henimita
M = 2.5 X
Mena he 1 henemita te teitei o te mea, ko te teitei o te ahua he 2.5 x 1 henemita = 2.5 henemita.
4. Ko te whakanui koki ina wātea te kanohi = 5X. Mena ko te pūwāhi tata = 25 cm, he aha te roa arotahi o te karāhe whakanui?
Mōhiotia:
Teitei o te mea (h o ) = 2 mm
Whakanui koki (M) = 5X
Pūwāhi tata (N) = 25 cm
E hiahiatia ana: Te roa arotahi
Rongoā:
Ko te tātai o te whakanui koki ina whakangā te kanohi:
M = N/f
5 = 25 henimita / wh
f = 25 henimita / 5
f = 5 henemita
Ko te roa arotahi o te karāhe whakanui = 5 cm.
5. Ka kitea tētahi mea e tētahi tangata mā te whakamahi i tētahi karāhe whakanui, ā, ko te roa arotahi he 15 cm. Mena ko te pūwāhi tata o ngā kanohi o te tangata = 30 cm, tātaihia te whakanui whānui o te karāhe whakanui.
Mōhiotia:
Ko te pūwāhi tata o te kanohi noa (N) = 30 cm
Ko te roa o te arotahi o te karāhe whakanui (f) = 15 cm (tohu tāpiri nā te mea kei te hūnuku te karāhe)
E hiahiatia ana: te whakanui mōrahi
Rongoā:
Ka puta te whakanui mōrahi ina tino teitei te wāhi noho o te kanohi. Ka puta te whakanui koki o te karāhe whakanui ina tino teitei te wāhi noho o te kanohi:
M = (N/f) + 1
M = (30 henimita / 15 henimita) + 1
M = 2 + 1
M = 3 ngā wā
6. He karāhe whakanui he 20 diopters te kaha whatu, ā, e whakamahia ana e te tangata he kanohi noa, he 25 cm te whānui. Mēnā he iti rawa te wāhi e uru ai, tātaihia te whakanui iti rawa.
Mōhiotia:
Te pūwāhi tata o te kanohi noa (N) = 25 cm
Te mana o te karāhe whakanui (P) = 20 diopters
E hiahiatia ana: Te whakanui iti rawa
Rongoā:
Te roa o te arotahi o te karāhe whakanui:
P = 1/f
20 = 1/w
wh = 1/20
f = 0.05 mita
f = 5 henemita
Ko te whakanui koki ina iti rawa te taunga:
M = N / f
M = (25 henimita / 5 henimita)
M = 5 ngā wā
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