Geometrical OpticsHard
Question
Optic axis of a equiconvex lens is the x - axis. The coordinates of a point object and its image are (-40 cm, 1cm) and (50 cm, -2 cm) respectively. lens is located at -
Options
A.x = + 20 cm
B.x = - 30 cm
C.x = -10 cm
D.origin
Solution
m =
= - 2 = 
⇒ | v | = | 2u |(90 - u) = 2 u ⇒ u = 30 cm
Hence lens location = - 40 + 30 = - 10 cm
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