Q. 164.8( 5 Votes )

A student has to

Answer :

Converging or convex lens.

As image is real


m = -3


hi=3ho


Image distance = 6 + object distance


v = 6 + u


we know that magnification=m=v/u


m = v/u


[since image is magnifed three times ]


-3u = 6 + u


4u=-6


u=-6/4


u=-1.5 m


v=6 - (-1.5)


v=7.5m


by using lens formula,






f =75/60=1.25m


Thus, Focal length of a given convex lens is 1.25m


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