Your are provided with two lenses of focal length 20cm and 30 cm, respectively ,these lens can diverge the light. Which lens will you use to obtain more divergent light? Name these lens.
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As they diverge light rays, they are concave lenses.
Lens of f=20 cm will be used as it will diverge the light rays more
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1
Focal length of any lens is the point where light converges. So, if focal length is more then the lens has converged the light to a larger distance that is it has converged less. Whereas, if the focal length is less then the light is converged at a smaller distance that is converged more.
So, we can affirm that lens of 20 cm should be used to converge light to a larger extent.
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