7.1 convex lense different distance

8/13/2019 7.1 Convex Lense Different Distance

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7.1


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Draw the ray diagram when the rays of light

pass through the lens. Draw the ray diagram when distance

between the convex lens on the objectvaries

State the characteristics of image formedby the convex lens when distance between

the lens on the object varies State the characteristics of image formed

by the concave lens

Learning Outcomes


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Convex Lens


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Try to look object at near objectusing the convex lens.

What can u see??? Upright or upside down??? Magnified or diminished?


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Try to look object at near objectusing the concave lens.

What can u see??? Upright or upside down??? Magnified or diminished?


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How about the slide projector?

Appreciate the scientist- researchand invent optical instrument.(microscope, telescope, camera,

magnifying glass)


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Real- image can be formed on thescreen.

Virtual- image cannot be formed onthe screen.

Change with concave lens, spec


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Characteristic of image formed bythe convex lens depend on thedistance between the lens on theobject.

Conclusion about convex lens


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Image formation

Convex Near object - virtual, upright,

magnified

Distant object- real, inverted,

diminished


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Image formed by concave lens

Concave upright, virtual, upright,

diminished


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Convex lens Distant object Focal length? Image formed? Real, Inverted Diminished


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Why human can see the things insurrounding are upright although theimages formed on the retina areupright?

Who create this? Camera


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Ray diagram


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Mastering Ray Diagram 155

1. Draw convex lens2. Draw the principle axis through theoptical centre

3. Mark the F and 2F4. Draw the object on the principle axis5. Draw 2 rays6. Use arrow7.The point of intersection location ofthe image8. Draw the image as the vertical arrow


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Draw Ray diagram

Distance Object Object Beyond 2F

Object at 2F Object between F and 2F Object at F Object between F and optical centre


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Try to draw on your book withoutlooking at the book

Any question?


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Concave lens

Raw diagram


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Summary


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Homework : Draw all the diagram onpage 156 in your note book

Read page 157 Any question?

7.1 convex lense different distance

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