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Question

If the power of a lens is + 0.1 D and if the object of size 2 cm is placed 5 cm before the lens. Find the size and position of the image formed.


A

image size = 4 cm, image distance = – 10 cm

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B

image size = 10 cm, image distance = – 4 cm

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C

image size = 4 cm, image distance = 10 cm

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D

image size = 4 cm, image distance = 5 cm

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Solution

The correct option is A

image size = 4 cm, image distance = – 10 cm


P = 1f ⇒ f = 10 cm

1v - 1u = 1f

1v - 1(5) = 1(10)

v = - 10 cm

vu = h/h10(5) = h/2

h/ = 4 cm

Image height = 4 cm


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