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S.K.V.D.BL.JANAK PURI G.G.S.S.D.BL.JANAK.PURI NEXT

CLASS VIII TO X NEXT

DEFINE THE OPTICAL INSTRUMENTS NEXT AFTER INTERACTING WITH THIS SOFTWARE STUDENTS WILL BE ABLE TO 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

1. MICROSCOPE 2. TELESCOPE 3. HUMAN EYE BACK NEXT

The simple microscope BACKHOME NEXT

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Microscopes are used for viewing tiny objects clearly by increasing the size of the image Tiny object Enlarge object BACK HOME NEXT

Microscope, any of several types of instruments used to obtain a magnified image of minute objects or minute details of objects. " RAY DIAGRAM BACK HOME

Microscope, any of several types of instruments used to obtain a magnified image of minute objects or minute details of objects. " RAY DIAGRAM BACK HOME NEXT

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 BACKHOMENEXT

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 BACKHOME NEXT

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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 BACK HOME Next SlideNext SlideNEX T

HYPERMETROPIA OR FAR SIGHTEDNESS PERSONS CANNOT SEE NEAR BY OBJECTS IMAGES FORMEDBEHIND RETINA A CONVEX LENS BRINGS BACK IMAGE TO RETINA BACK HOME NEXT