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# numerical

Asked by rupson 3rd April 2010, 4:05 PM
Answered by Expert
Answer:

f = +18 cm
v = +24 cm
u = ?

Therefore using the lens formula we get,

1/v - 1/u = 1/f

ie, 1/u = 1/v + 1/f

= 1/24 - 1/18

= (18-24)/(24x18)

= (-6)/(24x18)

= (-1)/(24x3)

= -1/72

thus, u = -72 cm.

Hope this helps
TopperLearning.com

Answered by Expert 8th April 2010, 11:40 AM
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