A covex lens of focal length 10cm is placed in contact with a concave lens of focal length 20cm. What will be the focal length of this combination of lenses ?
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please keep in this formula
Answer:
Concave lens with focal length 10cm
Step-by-step explanation:
focal length of convex lens =10cm
focal length of concave lens=20cm
focal length of combination =10-20
-10 cm
which is known as concave lens with focal length 10cm.