A drawing is placed 40 cm in front of a thin lens.If a virtual image forms at a distance of 50 cm from the lens,on the same side as the drawing,what is the focal length of the lens?
A)-45 cm
B)75 cm
C)90 cm
D)200 cm

Question

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The Answer of A drawing is placed 40 cm in front of a thin lens.If a virtual image forms at a distance of 50 cm from the lens,on the same side as the drawing,what is the focal length of the lens?
A)-45 cm
B)75 cm
C)90 cm
D)200 cm

A Drawing Is Placed 40 Cm in Front of a Thin