A person is not able to see objects farther than 80 cm clearly, while another person is not able to see objects beyond 120 cm, clearly. The powers of
A person is not able to see objects farther than 80 cm clearly, while another person is not able to see objects beyond 120 cm, clearly. The powers of the lenses used by them for correct vision are in the ratio -
A. `2:3`
B. `3:2`
C. `1:2`
D. `2:1`
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Correct Answer - B
`(1)/(f_(1))=(1)/(80)-(1)/(-oo)`
`(1)/(f_(2))=(1)/(-120)-(1)/(-oo)`
`(1)/(f_(2))xx(f_(1))/(1)=-(1)/(120)((-80)/(1))`
`(f_(1))/(f_(2))=(2)/(3)`
`(P_(1))/(P_(2))=(3)/(2)`
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