a convergent lens of power 5d is combined with a diverging lens of power -3d. What is the focal length of the combination?
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Answer:
Ray optics
Explanation:
Power Equivalent ( P ) = P 1 + P 2
= 5 + ( - 3 )
= 2 D .
★ Power = + 100 / Focal Length ( in cm )
Focal Length = 1 / Power
= 100 / 2
Focal length ( F ) = + 50 Cm
The focal length shows the type of lens is Converging ( i.e Convex lens )
Hope it helps you
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