8. One half of the convex lens of focal length10cm is covered byblack paper. Can such lens produce an image of a completeobject placed at a distance of 30 cm from the lens? If yes then atwhat distance will be the image formed? Draw a ray diagram tojustify your answer?

8. One half of the convex lens of focal length10cm is covered byblack

1.	8. One half of the convex lens of focal length10cm is covered byblack paper. Can such lens produce an image of a completeobject placed at a distance of 30 cm from the lens? If yes then atwhat distance will be the image formed? Draw a ray diagram tojustify your answer?
Answer» height of object= 4cm=h0focal length=f=20cm.u=-15cm after sign conventions.by lens formula,1/f=1/v-1/u1/v=1/f+1/u=1/20-1/15=3-4/60=-1/60v=-60cmsm=v/um=hi/ho=v/uhi=hoxv/u=4x(-60)/(-15)=8cmhi=8cm∴ Position of image is 60cm in front of lens size of image is 8cmnature of image is virtual and erect.