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 and height of the image

Answer»

Solution :Data : Convex lens , `f=20` cm ,
`u=-30 cm , h_(1)=2 cm , V=? , h_(2) =? , M=?`
`(h_(2))/(h_(1))=u/v`
`therefore (h_(2))/(2 cm)=(60 cm)/(-30 cm) =-2`
`therefore h_(2)=-2XX2 cm =-4cm`
`h_(2)` is negative . This shows that the IMAGE is inverted .


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