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= 1/25 - 1/20
=20/500 - 25/500
= - 5/500
= - 500/5
= - 100 cm
(b) m =|si /so|
= | -100 / 20 |
= 5 cm
(c) m= hi/ho
5 = hi / 2
hi = 5×2 = 10 cm