Question

One half of a convex lens of focal length 10cm is covered with a black paper.Can such a lence produce an image of a complete object placed at a distance of 30cm from the lens?Draw a ray diagram to justify your answer.A 4cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm.The distance of the object from the lens is 15cm.Find the nature,position and size of the image?

Answer 1

The convex mirror can produce image though it is covered with black paper.

ho=4cm

f=20cm

u=-15cm

By lens formula,

1/f=1/v-1/u

1/v=1/f+1/u=1/20-1/15=3-4/60=-1/60

v=-60

m=v/u=hi/ho

hi=8cm

The size of the image is 8cm.The image is virtual & erect.

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