
PRETEST MATERI OPTIK
Authored by Desy Shafira Siahaan
Science
12th Grade

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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 20 pts
Lensa plan konveks dengan jari-jari 20 cm dan indeks bias 3/2. Sebuah benda terletak di depan lensa dan dibentuk bayangan nyata dengan perbesaran 2 kali, maka:
1. Letak benda 60 cm di depan lensa
2. Jarak fokus lensa 60 cm
3. Letak bayangan 120 cm di belakang lensa
4. Bayangan bersifat tegak
Dari pernyataan diatas, pertanyaan yang benar adalah…
1 dan 3
2 dan 4
1 dan 2
1, 2 dan 4
2.
MULTIPLE CHOICE QUESTION
30 sec • 20 pts
Perhatikan gambar di bawah ini!
Kekuatan lensa pada gambar berikut adalah…
0.5 dioptri
1.0 dioptri
1.5 dioptri
2.0 dioptri
3.
MULTIPLE CHOICE QUESTION
30 sec • 20 pts
Amatilah gambar di bawah ini!
Bagian mata yang ditunjukkan nomor 3 dengan… dan berfungsi sebagai…
Pupil, melindungi mata dari luar.
Iris, membawa warna pada mata.
Kornea, mengatur intensitas cahaya.
Lensa, menangkap bayangan benda.
4.
MULTIPLE CHOICE QUESTION
30 sec • 20 pts
Berikut ini ciri-ciri yang dimiliki oleh seseorang yang mengalami gangguan mata.
1. Tidak jelas melihat benda pada jarak dekat.
2. Bayangan jatuh di belakang retina.
3. Ditolong dengan kacamata berlensa cembung.
Orang tersebut menderita gangguan mata yaitu…
Miopi
Hipermetropi
Presbiopi
Astigmatisma
5.
MULTIPLE CHOICE QUESTION
30 sec • 20 pts
Perhatikan gambar berikut di bawah ini!
Fungsi bagian yang ditunjukkan nomor 4 pada gambar di atas adalah untuk….
Mengatur besar kecilnya diafragma.
Memfokuskan bayangan objek bergerak.
Mengatur intensitas cahaya yang masuk.
Menangkap bayangan yang dibentuk lensa.
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