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How are power and focal length of a lens...

How are power and focal length of a lens related? You are provided with two lenses of focal length 20 cm and 40 cm respectively. Which lens will you use to obtain more convergent light?

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MODERN PUBLICATION-REFLECTION AND REFRACTION-EXAMPLE
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  8. Draw a rays diagram showing the image formation by a convex lens when ...

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  9. Draw a rays diagram showing the image formation by a convex lens when ...

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  16. Define power of a lens. What is its unit? One of student uses a lens o...

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  17. A student focussed the image of a candle flame on a white screen using...

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