an optical instrument

An Optical Instrument will be

presentation are ..

E y e s

C a me r a D i g i t a l

T e l e s c o p e

M i c r o s c o p e

Myopia

Someone can see the object if someone have convex lens

P = - 100/PRP : Kuat lensa (dioptri)

PR : Titik jauh (cm)

P = 100/x – 100/PP

P : Kuat lensa (dioptri)

PP: Titik dekat (cm)

x : jarak yang ingin dibaca

Astigmatism is one where rays that propagate in two perpendicular planes have different focus. Astigmatism can help with cylindrical lens

Astigma adalah dimana cahaya yang menyebarkan dalam dua bidang tegak lurus yang mempunyai fokus berbeda. Astigma bisa dibantu dengan lensa silinder

Cataract

Kamera digital adalah alat untuk membuat

gambar dari obyek untuk selanjutnya

dibiaskan melalui lensa kepada sensor CCD

(ada juga yang menggunakan sensor CMOS)

yang hasilnya kemudian direkam dalam

format digital ke dalam media simpan digital

Camera digital is instrument to make a

picture from object to deflect through lens

to sensor CCD (also able use with sensor

CMOS) that output to record in format digital

and then save in storage digital

Clasification of camera digital are :

Videos camera

o Professional camera : usually use in channel

television

o Camcorder

Silent camera

o Digital pocket camera

o Camera digital prosumer

o SLR digital (Single Lens Reflect digital)

Formula !! Teropong bintang

there are 2 lens fob >> fok

Magnification angular (perbesaran sudut) :

oWithout accommodation

d = fob + fok

o Accommodation maximum

d = fob + Sok

M = fob / fok

M = fob / Sok

• Teropong bumi

There are 3 lens objektive, ocular, inverted

Magnification angular :

o Without accommodation

d = fob + 4fp + fok

o Accommodation maximum

d = fob + 4fp + Sok

M = fob / fok

M = fob / Sok

Microscope

1. Magnification objective lens

2. Magnification ocular lens

a. Without accommodation

Sok = fok

b. Accomodation maximum

Length of microscope (d) = S’ob + Sok

to search value of Sok , used comparison

3. Quantity of magnification

Mok = Sn / fok

Mok = Sn / fok + 1

1/ fok = 1/ Sok - 1/ Sn

Mtot = Mob + Mok