Post on 17-Dec-2015
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S.K.V.D.BL.JANAK PURI
G.G.S.S .D.BL.JANAK.PURI
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CLASS VIII TO X
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DEFINE THE OPTICAL INSTRUMENTS
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AFTER INTERACTING WITH THIS SOFTWARE STUDENTS WILL BE ABLE TO
DRAW OPTICAL INSTRUMENTS & RECOGNISE THEM
PROVIDE INFORMATION ABOUT THE WORKING OF OPTICAL INSTRUMENTSDRAW & LABAL THE HUMAN EYE
PROVIDE INFORMATION OF DEFECTS OF VISION &ITS CORRECTION
1. MICROSCOPE
2. TELESCOPE
3. HUMAN EYE
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The simple microscope
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Microscopes are used for viewing tiny objects clearly by increasing the size of the image
Tiny object
Enlarge object
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Microscope, any of several types of instruments used to obtain a magnified image of minute objects or minute details of objects.
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RAY DIAGRAM
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Microscope, any of several types of instruments used to obtain a magnified image of minute objects or minute details of objects.
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RAY DIAGRAM
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Two convex lenses are sufficient to make a microscope. Each converges the light rays that pass through it. One lens, called the object lens, is positioned close to the object to be viewed. It forms a magnified and inverted (upside-down) image. This is called a real image because the light rays actually pass through the place where the image lies. This image is viewed by the second eye piece
MICROSCOPE
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ELECTRON MICROSCOPE
Early telescope
TELESCOPE
RAY DIAGRAM
Telescope are used to bring near vary distant objects
Distant object
Seen near by
Telescope has two lenses. Both are convex—that is, thicker in the middle than at the edges. The lens closer to the object is called the objective lens.
This lens collects light from a distant source and brings it to a focus as a “real” and inverted image within the telescope tube. The lens in the eyepiece magnifies the image formed by the objective lens.
Telescope, device used to form a magnified image of a distant object. A very simple telescope can be made from two convex lenses: one (the object glass, or objective)
forms an upside-down image of the distant object; the
second is used simply as a magnifying glass to examine
this image.
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SIMILARITIES BETWEEN EYE&CAMERA
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WHEN WE LOOK
MUSCLES CONTRACT NEAR BY OBJECTS CILIARY
LENS ASSUMES ROUND SHAPE
IMAGE AT RETINA FORMS
FAR AWAY OBJECTS CILIARY MUSCLES RELAXED LENS
ASSUMES THIN SHAPE IMAGE FORMS AT RETINA
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WORKING OF THE EYE
MYOPIA OR N EAR SIGHTEDNESS
PERSONS CANNOT SEE DISTANT OBJECTS IMAGE IS FORMED IN
FRONT OF RETINA
A CONCAVE LENS BRINGS IMAGE BACK TO RETINA
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HYPERMETROPIA OR FAR SIGHTEDNESS
PERSONS CANNOT SEE NEAR BY OBJECTS IMAGES FORMEDBEHIND
RETINA
A CONVEX LENS BRINGS BACK IMAGE TO RETINA
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