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CBSE Class 10 Answered

How do i solve this?
Asked by Jaziya | 21 Apr, 2009, 10:34: AM
Expert Answer

f = - 20 cm, m = 3, u =?

m = - v / u

3 = - v / u

v = - 3 u

using mirror formula

1/f = 1/v + 1/u

- 1/20 = - 1/3u + 1/u

-1/20 = 2 / 3u

u = - (40/3) cm

Answered by | 27 Apr, 2009, 11:09: AM
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