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A convex lens forms the image of the sun...

A convex lens forms the image of the sun at a distance of `10 cm`. Where will be the image when
(i) another lens of same power but dounle the aperture is used ?
(ii) another lens of same aperture but double the power is used ?

Text Solution

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(i) At `10 cm` only, because aperture does not affect `f`.
(ii) `5 cm` because when `P` is doubled, `f` is halved.
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PRADEEP-RAY OPTICS-Short Answer(b)
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  10. What is focal length and power of a rectangular glass slab ?

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  11. How does focal length of a convex lens change if violet light is used ...

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  13. In Fig., line AB represents a lens through which course of rays is as ...

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  16. Prove that mu = (1)/(sin C)' where C is the critical angle.

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