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indrayani bargaje Grade: 10
        a diverging  lens forms an image 1/3 rd the size of an object that is 24 cm away from the lens. determine the focal length of the lens.
6 years ago

Answers : (1)

Vikas TU
6845 Points
										

Diverging lens :


object height = h


image height = h/3


object distance (u) = - 24 cm


v = ?


f = ?


m = H/h =h/3/h = h/3h = 1/3


m = 1/3


m = -v/u


1/3 = -v/-24


v = 8 cm


Now by lens formulae,


1/f = 1/v -1/u


1/f = 1/8 - (-1/24)


1/f = 1/8 + 1/24


     = 3 + 1/24


     = 4/24


     = 1/6


   f = 6 cm


Hence the focal length of the lens will be 6 cm.


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Pleazzzzzzzz


approveeeee

6 years ago
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