a lens X has focal length 40cm and lens Y 20cm .which would obtain more convergent beam of light ?
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Convergence is expressed in terms of power.
Power is inversely proportional to focal length.
Hence a lens with a smaller focal length will have a greater power and converge more.
Thus lens Y will converge more
Power is inversely proportional to focal length.
Hence a lens with a smaller focal length will have a greater power and converge more.
Thus lens Y will converge more
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