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| 1. |
an object of hight 5cm is placed near infront of a convex lens of focal length 20cm .and image of hight 20cm is formed behind the mirror find ? 1)u 2)v 3) distance between image and object |
| Answer» GIVEN, u=-20cmf=10cmv=?We knowf1 = V1 − u1 101 = v1 − 20(−1) v1 = 202−1 v=20cmWe knowmagnification (M)= H o h i = u−v or, −2020 =−1= h o h i since,h 0 =5cmso,h i =−5cmnature = real image | |