Question

A convergent lens has a focal length of 30cm. At what distance should an
of height 5cm from the optical centre of the lens be placed so that an erect image
of 15cm is formed from the lens on the same side of the object. Find the size of the image ​

Answer 1

Answer:

Substitute, v=−15cm, u=−30cm and h1=5cm to find the value of h2. Therefore, the object should be placed 30 cm from the optical centre and the size of the image formed is 2.5 cm. Additional information: The distance between focal point and lens is called focal length.

Explanation:

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