Question

One half of a convex lens of focal length 10 cm is covered with

a black paper. Can such a lens produce an image of a complete

object placed at a distance of 30 cm from the lens?
can anyone help me​

Answer 1

Answer:

1.A convex lens can produce the complete image of the object even though half of the lens is covered .

Because light rays coming from the object can be refracted from the other part of the lens.

Refer the attachment for ray diagram.

2.Given:

 height of object= 4cm=h0

focal length=f=20cm.

u=-15cm after sign conventions.

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=-60cms

m=v/u

m=hi/ho=v/u

hi=hoxv/u

=4x(-60)/(-15)=8cm

hi=8cm

∴ Position of image is 60cm in front of lens

size of image is 8cm

nature of image is virtual and erect.

I hope it helps you♥️♥️