P.7 LESSON ONE.pptxghffghgdfvjjjjjggvcfv

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1. P.7 SCIENCE LESSON ORGANISED BY CYRUS

2. Examples of optical instruments Plane mirrors Telescopes Lens camera Binoculars Pinhole camera Spectacles Lenses Projectors Periscopes Microscope Magnifying glasses Human eye

3. Uses of different optical instrument to people OPTICAL INSTRUMENT ITS USE TO PEOPLE Microscope For viewing tiny objects which cannot be seen using our naked eyes Projector It is used to form images on screens It is commonly used by video jokeys , pastors, teachers etc. Telescope It is used to view distant objects clearly It is commonly used by astronomer Binocular It is used to view distant objects clearly It is mostly used by tourists and soldiers Spectacles They are used to correct eye defects Kaleidoscope It is used to produce colourful designs and patterns.

4. A plane mirror Is a mirror with a flat reflecting surface .

5. Why is a plane mirror polished on one surface? To reflect light

6. Name the type of reflection produced by a plane mirror. Regular reflection

7. How is an image similar to an echo ? Both an image and an echo are results of reflection .

8. An image Is a light picture of an object on the screen or film .