The power of combination of lenses +5D . If the power of combination is to be changed to +4D. Write the nature of lenses to be added and find focal length .
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To change the power of the combination, we have to add a concave lens of power -1 D
Let the focal length of the concave lens be f metre. So, -1 = 1/f => f = 1/ (-1) = -1 m
So, focal length of the required lens in 1 m or 100 cm.
Let the focal length of the concave lens be f metre. So, -1 = 1/f => f = 1/ (-1) = -1 m
So, focal length of the required lens in 1 m or 100 cm.
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