A man's shortest distance of distinct vi...

A man's shortest distance of distinct vision is `20 cm`. What wil be the type and power of the spectacle lens which he would he would require to enable him to read a book at a distance of `60 cm` ?

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A man's shortest distance of distinct vision is `20 cm`. What wil be the type and power of the spectacle lens which he would he would require to enable him to read a book at a distance of `60 cm` ?

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