PERCOBAAN
CERMIN SFERIK
I.
Tujuan
·
Memahami
sifat bayangan yang dibentuk oleh cermin sferik
·
Menentukan
jarak titik fokus cermin sferik
II.
Alat
·
Bangku
optik
·
Senter
·
Benda
( sebagai objek )
·
Cermin
cekung dan cermin cembung
·
Mistar
panjang
III. Teori
Cermin memiliki tampilan bagian
yang mengkilap dan cermin memiliki tampilan cermin datar, cermin cembung dan
cermin cekung ( merupakan cermin sferik ). Cermin sferik memiliki bentuk
lengkung dan memiliki jari – jari.
Cermin cekung :
Aturan
sinar istimewa pada cermin cekung :
(1)
Sinar
datang sejajar sumbu utama akan dipantulkan melalui titik fokus
(2)
Sinar
datang menuju titik fokus akan dipantulkan sejajar sumbu utama
(3) Sinar datang menuju titik pusat kelengkungkan akan dipantulkan kembali melalui titik pusat
kelengkungan
Cermin
Cembung
Aturan
sinar istimewa pada cermin cembung :
(1)
Sinar
datang sejajar sumbu utama akan dipantulkan seolah – olah melalui titik fokus
(2)
Sinar
datang menuju titik fokus akan dipantulkan sejajar sumbu utama
(3) Sinar datang menuju titik pusat kelengkungan akan dipantulkan seolah – olah melalui titik
pusat kelengkungan
Gambar 2. Aturan
sinar istimewa pada cermin cembung
IV. Prosedur Percobaan
·
Susunlah
rangkaian seperti gambar di bawah ini
- Setelah
rangkaian percobaan selesai anda rangkaikan, selanjutnya anda mengikuti
petunjuk yang diberikan guru untuk menentukan letak benda dari cermin.
- Nyalakan
sumber cahaya, kemudian anda melakukan pencarian bayangan, bayangan yang jelas
ditangkap layar merupakan jarak benda yang sesungguhnya.
- Ukurlah
jarak bayangan yang anda dapat lalu isilah tabel percobaan
- Selesai
anda mengambil data dan mengisi tabel pengamatan, selanjutnya anda melakukan
anlisa sesuai dengan pengarahan yang diberikan guru.
V.
Data Percobaan
Tabel
Pengamatan cermin sferik
|
No. Percobaan |
Jarak benda s (cm) |
Jarak bayangan s’(cm) |
Perbesaran bayangan M |
Sifat bayangan |
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T |
P |
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P |
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VI.
Kesimpulan
....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
DATA PERCOBAAN
I.
JUDUL
PERCOBAAN : ..........................................................................................
II.
TANGGAL
PERCOBAAN :
..........................................................................................
III.
KELAS
:
..........................................................................................
IV.
KELOMPOK
:
..........................................................................................
V.
ABSENSI
:
..........................................................................................
Praktikan
yang hadir :
1.
..................................................
( ) 6.
....................................................... ( )
2.
...............................................
( ) 7.
....................................................... ( )
3.
...............................................
( ) 8.
....................................................... ( )
4.
...............................................
( ) 9.
....................................................... ( )
5.
...............................................
( ) 10.
....................................................... ( )
Praktikan yang tidak
hadir :
1.
..................................................
( ) 4.
....................................................... ( )
2.
...............................................
( ) 5.
....................................................... ( )
3.
...............................................
( ) 6.
....................................................... ( )
VI.
DATA
PENGAMATAN
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Medan,
Asisten Praktikum
( )
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