1.

A thin convex lens has focal length f_(1) and a concave lens has focal length f_(2). They are kept in contact. Now, match the following two columns.

Answer»

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Solution :`THEREFORE 1/F=1/(f_(1))+1/(f_(2))orP=P_(1)+P_(2)`
`f_(1)and P_(1)` are POSITIVE, `f_(2) and P_(2)` are negative.
If `ABS(f_(1))gtabs(f_(2))`, POWERS of system is negative
If `abs(f_(1))ltabs(f_(2))`, powers of system is positive .


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