OPTICAL INSTRUMENTS

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OPTICAL INSTRUMENTS
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OPTICAL INSTRUMENTS
DEVELOPED BY
NEENA DHAWAN
S.K.V.D.BL.JANAK PURI
PUSHPA DEVI
G.G.S.S .D.BL.JANAK.PURI
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TARGET GROUP
CLASS VIII TO X
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LEARNING OBJECTIVES
AFTER INTERACTING WITH THIS SOFTWARE STUDENTS
WILL BE ABLE TO
DEFINE THE OPTICAL INSTRUMENTS
DRAW OPTICAL INSTRUMENTS RECOGNISE THEM
PROVIDE INFORMATION ABOUT THE WORKING OF OPTICAL
INSTRUMENTS
DRAW LABAL THE HUMAN EYE
PROVIDE INFORMATION OF DEFECTS OF VISION ITS
CORRECTION
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OPTICAL INSTRUMENT
1. MICROSCOPE
2. TELESCOPE
3. HUMAN EYE
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The simple microscope
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COMPOUND 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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RAY DIAGRAM
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
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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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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RAY DIGRAM
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ELECTRON MICROSCOPE
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Early telescope
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TELESCOPE
RAY DIAGRAM
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Telescope are used to bring near vary distant
objects
Seen near by
Distant object
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Telescope has two lenses. Both are convexthat
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.
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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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LARGEST TELESCOPE
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HUMAN EYE
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SIMILARITIES BETWEEN EYECAMERA
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NORMAL EYE
WHEN WE LOOK
NEAR BY OBJECTS CILIARY
MUSCLES CONTRACT
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
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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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