Question

an object is placed at focus of a convex lens of focal lebgth 30 cm then find of position of image​

Answer 1

The image of object would be formed at infinity...

here, u = -30cm , f = 30cm and v = ?

we know 1/v - 1/u = 1/f

=> 1/v = 1/f + 1/u

=> 1/v = 1/30 - 1/30

=> 1/v = 0

=> v = 1/0 = infinity

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