1.

The focal length of a convex lens is 20 cm . If an object of height 2 cm is placed at 30 cm from the lens , find the magnification produced by the lens .

Answer»

Solution :DATA : Convex LENS , `f=20` CM ,
`u=-30 cm , h_(1)=2 cm , v=? , h_(2) =? , M=?`
`M=(h_(2))/(h_(1))=(-4 cm)/(2 cm)=-2`
M is negative , indicating that the IMAGE is inverted .
The magnification produced by the lens =-2.


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