Question

i) Define optical centre of a spherical lens.

ii) A convergent lens has a focal length of 20 cm. At what distance should an object of height

4 cm from the optical centre of the lens be placed so that its image is formed 10 cm away

from the lens. Find the size of the image also.​

Answer 1

Answer:

Optical centre is the point lying on the principal axis of a lens through which light passes through without undergoing any deviation. To find: Object distance = ? Size of the image, h2 = ? Therefore, object is at a distance of 20 cm on the left side of the lens.

Explanation:

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