Question

An object is placed at 30cm distance from the optical centre of a convex lens. Image formed at 30cm distance from the pole. Find the focal length of the lens​

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Secondary School Science 5 points

An object is placed at 30cm distance from the optical centre of a convex lens. Image formed at 30cm distance from the pole. Find the focal length of the lens

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pranathi0707

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Answer:

15

Explanation:

object distance and the image distance is same from the pole i.e 30cm in a convex lens, it means the nature of the image is real,inverted and same size to obtain rhis nature of image object should be placed at 2*f therefore f=30/2=15cm.

Even we can calculate this by using the formula :1/f=1/v-1/u

1/f=1/30-(-1/30)

=1/30+1/30

= 2/30

1/15

there fore. f=15cm