EYE Eyes are one of the human senses of vision that serves as a tool. Parts of the eye is important, among others; aquaeus humor, accommodation muscle, eye lens, cornea, pupil, iris, retina, vitreous humor, yellow spots, blind spots, and optic nerve. Defects in the eye include: 1. Myopia (nearsightedness) 2. Hipermetropi (farsightedness) 3. Presbiopi (old currency) 4. astigmatism
GLASSESGlasses are optical devices that serve as visual aids in eye defects. For example Astigmatism eye defects assisted by cylindrical glasses.
LOOP (MAGNIFYING GLASS)Loop is an optical instrument consisting of a convex lens to see small objects to appear more clear and magnified. The nature of the shadow on the loop that is virtual, erect and enlarged. Loop equation: For maximum eye berakomodasi s = -25 cm (negative sign (-) indicates a shadow in front of the lens) to obtain:
CAMERA The camera is a tool used to produce a photographic image on the film negative. The camera consists of several parts, namely: Convex lens Diaphragm Aperture Plates film The nature of the shadow: 1. real 2. inverted 3. minimized
MICROSCOPEmicroscope is an optical instrument used to see small objects that can not be seen directly by eye. microscope consists of two convex lenses, namely; a. lens obyektife b. ocular lensmicroscope observations Microscope observations are divided into; a. microscope observation without accommodation: M = (Sob / Sob) x (Sd / Fok) b. Microscope observations with maximum accommodations: M = (Sob / Sob) x [(Sd / Fok) +1]
BINOCULARS Binoculars or a telescope is used to observe the optical objects are very far to look more closely and clearly. 1) Binocular Star Bias-Binoculars Binoculars-reflection 2.) Field Binoculars (Binoculars Earth)
EvaluationA microscope has objekyive and eyepiece lenswith a focal length of each 3cm and 4cm. Thedistance between the second lens is 25cm.Determine the amount of magnification of themicroscope for the eye does not berakomodasi!Answer:Objects located on the righteyepiece focal pointfob = 3 cmFok = 4 cmd = 25 cm where d = Sob because Sok +Sok =Fok = 4 cmSo: 25cm = Sob + 4 cmSob = 21 cmEyes not berakomodasi: