Question

draw h lebelled diagram for the formation of image by a convex lens of focal length is 15 cm when object is placed at a distance of 25 cm from the lens determine the size of image formed if size of object is 4 cm​

Answer 1

f=-15cm,u=-25cm,ho=4cm

By lens formula,

1/f=1/v-1/u

1/-15=1/v-1/-25

-1/v=1/15+1/25=15+25/15x25=40/375=8/75

v=-75/8=-9.5 is the answer.

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