Basic Maths and Units and DimensionsHard

Question

The principal axis of a convex lens is along x axis. The coordinates of an object and image are (-20cm, 2cm) and (25cm, -1cm). Lens is located at :-

Options

A.x = + 10 cm
B.x = -2.5 cm
C.x = 2 cm
D.x = - 3 cm

Solution

     
m = ⇒ u = 2v
Distance = u + v = 45
2v + v = 45
v = 15 cm
Position of lens x = + 10 cm

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