A student uses a lens of focal length 40 cm and other of -20 cm...write nature and power of each lens
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1). It is covex lens,
power, P= 1/f
= 100/40 = 2.5D
2). It is concave lens
power= 100/-20. = - 5 D
power, P= 1/f
= 100/40 = 2.5D
2). It is concave lens
power= 100/-20. = - 5 D
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