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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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