Lup

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Lup adalah lensa positif yang berfungsi sebagai kaca pembesar, digunakan untuk mengamati sebuah benda kecil agaraetailnya dapat diketahui. Bayangannya terletak di depan lensa, bersifat maya, tegak, dan diperbesar. Lup memiliki perbesaran anguler, yaitu perbandingan antara sudut pandang jika mata melihat memakai lup dengan sudut pandangjika mata melihat tanpa memakai lup. Perbesaran anguler pada lup ada tiga sebagai berikut.

  • Mata berakomodasi maksimum
  • Benda diruang I dan bayangan diruang IV (s’ =-p)
  • Mata tidak berakomodasi
  • Benda difokuskan bayangan ditak terhingga (s’ = -r)
  • Mata berakomodasi pada jarak X

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