Sebuah cermin cekung memiliki jarak fokus 6 cm, tanpa menggunakan rumus tentukan sifat bayangan yang dihasilkan cermin cekung jika benda diletakkan pada jarak 3 cm

sebuah cermin cekung memiliki jarak fokus 6 cm, tanpa menggunakan rumus tentukan sifat bayangan yang dihasilkan cermin cekung jika benda diletakkan pada jarak 3 cm

Jawaban yang benar adalah maya, tegak, diperbesar

Ada empat sifat bayangan yang dibentuk oleh cermin cekung.
Pertama, jumlah ruang letak benda dan letak bayangan selalu 5.
Kedua, jika ruang bayangan lebih besar dari ruang benda, maka sifat bayangannya diperbesar.
Ketiga, jika ruang bayangan lebih kecil dari ruang benda, maka sifat bayangannya diperkecil.
Terakhir, hanya bayangan di ruang 4 yang bersifat maya dan tegak. Selain dari itu bersifat nyata dan terbalik.

Untuk pembagian ruang benda pada cermin cekung adalah
Ruang 1 : benda berada antara titik pusat lensa sampai titik fokus lensa
Ruang 2 : benda berada di antara titik fokus lensa sampai jari-jari kelengkungan cermin (2f)
Ruang 3 : benda berada lebih dari jari-jari kelengkungan cermin (2f)

Diketahui :
f = 6 cm
so = 3 cm

Ditanya : sifat bayangan

Jawab :
Benda berada di 3 cm. Berarti benda berada di ruang 1 (antara titik pusat cermin sampai fokus cermin, 0 – 6 cm)
Ruang benda + ruang bayangan = 5
1 + ruang bayangan = 5
Ruang bayangan = 5 – 1
Ruang bayangan = 4

Ruang bayangan lebih besar dari ruang benda –> diperbesar
Bayanga di ruang 4 –> maya, tegak

Jadi sifat bayangan adalah maya, tegak, diperbesar

Rekomendasi lainnya :

Baca Juga :  Read the text and then answer the questions. One day my uncle told me about his childhood. When he was ten years old, he liked to climb a mango tree. He usually climbed the tree with some friends. Then they picked some mangoes without permission. Yap, they liked to steal mangoes. They frequently ate mangoes on the tree. They had prepared a fruit peeler and a plastic bag for the garbage. What a good preparation! They didn't want to throw the garbage everywhere. They kept the environment clean. That's a good point. But stealing fruits is a bad point. My uncle said it was so fun. Sometimes they were caught by the owners. They had ever met both kind and unkind owners. A kind owner was never angry to them. She/he let them pick some mangoes. "Don't eat too many mangoes or you will get a stomachache" a kind owner advised one day. Meanwhile an unkind owner punished them to clean a pool and back yard. There was one owner who was really angry to them. Then he came to the kids' parents and asked for much money for the mangoes they had eaten. Their parents couldn't afford it. The owner gave them some weeks to pay or he would call the police. Then he and his friends tried to earn money to help their parents. After school he worked at a car wash. My uncle learnt that earning money was not easy. But it wasn't impossible. After three weeks, he could gave the money to the mango-tree owner. Magically, the owner turned into a nice guy and asked my uncle to keep the money. He gave the money to his parents. Finally he never stole the mangoes anymore but still liked to climb a mango tree 1. What kind of activity liked by the writer's uncle? 2. What kind of punishment sometimes had by the writer's uncle? 3. What did the mango owner's do to the writer's uncle's parents? 4. What kind of tense mostly found in the text above? 5. What is the purpose of the text above? 6. I can't find my purse. (Lose) 7. Gerry can't remember the time of the interview. (forget) 8. Amy is on her way to school. (go) 9. I don't know the man. (never meet) 10. There's something wrong with my dad's leg. (break)​
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