m = 4 = v/u =4 v = 4u then, 1/f = 1/v - 1/u substitute v with 4u, 1/f = 1/4u - 1/u 1/f = 1/4u - 4/4u 1/f = -3/4u =f=-4u/3 total dist, u + 4u = 1.5 * 100 (m-cm) 5u = 150 u = 150/5 = 30cm substituting u in -4u/3 -4 * 30/3 -120/3 = -40cm hope so you got it t...
10 years ago