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Question

When an object of height 3 cm is placed at a distance of 30 cm from a lens, a real image is formed at a distance of 60 cm. Find out the height of the object.


A

-6 cm

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B

+6 cm

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C

-3 cm

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D

+3 cm

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Solution

The correct option is A

-6 cm


Here,

Image distance, u = -30 cm

Object distance, v = +60 cm

Height of object ho= 3 cm

Height of image hi= ?

Using magnification

m=uu =+6030=2

Also, m=hiho=hi3

hi3=2

hi=6 cm

The negative sign shows that the image is real and inverted.


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