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03-07-2016
Physics

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an object is 25 cm away from a convex len.the height of the image is twice the height of the object.find it's focal length.

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olemakpadu olemakpadu

07-07-2016

Object distance = 25cm, u = 25cm

Image = 2 = v/u; v = 2*u = 2*25 = 50cm

By mirror formula:

1/u + 1/v = 1/f

1/25 + 1/50 = 1/f

1/f = 1/25 + 50

1/f = (2 + 1)/50

1/f = 3/50

f = 50/3

f ≈ 16.667 cm

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