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When is the magnification produced by a ...

When is the magnification produced by a lens (1) positive (2) negative ?

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The magnification produced by a lens is (i) positive when the image is virtual (as it erect) (ii) negative when the image is real (as it is inverted).
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  16. What is colour-blindness ?

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  17. Why are some persons colour-blind ? What is the cause of this defect ...

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  18. What are the difficulties faced by a colour-blind person ?

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  19. Draw a figure explaining various terms related to a lens

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