Question

5. The focal length of a convex lens is 20cm. if an object of height 2cm is placed at 30cm
from the lens, find the position and nature of the image. Also find the height of the image
and the magnification produced by the lens.​

Answer 1

Explanation:

Solution :

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<br> v= 60 cm , v is positive. <br> The image will be formed at 60 cm from the lens and on the other side of the lens with respect to the object. It is a real image. <br> (ii)

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is negative. This shows that the image is inverted . <br> The height of the image = - 4 cm <br> (iii)

<br> M is negative, indicating that teh image is inverted. <br> The magnification produced by the lens = -2