Question

A convex lens forms a real and inverted image of a pencil at a distance of 40cms from the lens the image formed is of the same size as the object.Find the focal length and power of the lens. At what distance is the object placed from the lens?​

Answer 1

Answer:

Solution :

Data : Convex lens, v = 40 cm M = -1, f = ?

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<br> v = -v = -40 cm <br> The pencil is placed at 40 cm from the convex lens. <br>

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<br> The focal length of the lens = 20 cm <br>

<br> The power of the lens = 5 D

Answer 2

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