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Bharat Dash
Asked: 2022-11-07T05:18:14+05:30 In:

A 20 D lens is used as a magnifier. Where should the object be placed to obtain maximum angular magnification? (Given, D=25 cm).
A. 4.17 cm
B. 4.7 cm
C. 4.07 cm
D. None of these

A 20 D lens is used as a magnifier. Where should the object be placed to obtain maximum angular magnification? (Given, D=25 cm).
A. 4.17 cm
B. 4.7 cm
C. 4.07 cm
D. None of these
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1 Answer

  1. Correct Answer – A
    Focal length of the lens,
    `f=(1)/(20)m=(100)/(20)cm = 5 cm`
    Maximum angular magnification is obtained when final image is formed at D. Hence,
    `(1)/(-25)-(1)/(-u_(o))=(1)/(5)rArr u_(o)=4.17 cm`

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