Question

an object placed at distance of 30cm on ascale while convex lens at40cm.find the focal length if image obtain at screen at 50vm.draw ray diagram for above case?​

Answer 1

Answer:

An object is placed at 30cm from a convex lens and its real image is formed at 20cm away from the lens. Calculate the focal length of convex lens. Draw ray diagram also.

December 27, 2019avatar

Geeta Tejwani

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ANSWER

Here,

Image distance=v=20cm,

Object distance=u=−30cm,

Lens equation is given by,

v

1

−

u

1

=

f

1

,

putting the values we get,

20

1

−

−30

1

=

f

1

,

∴f=12cm

∴ Focal length of convex lens=f=12cm

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