What will be the focal length of the lens combination when a lens of power 5D is kept in contact with a lens oj power -2D?(a) 45cm(b) 33.3 cm(c) 25cm(d) 16.5cm
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Total power = 5+(-2)
= 5-2= 3D
focal length = 1/P
= 1/3
= 0.33m = 33.3cm
= 5-2= 3D
focal length = 1/P
= 1/3
= 0.33m = 33.3cm
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