Question

A student uses a lense of focal length 40cm and another of focal length -20cm. What is the focal length of the combination also find the nature of combination

Answer 1

Answer:

Nature of lens of focal length 50cm--convex lens

nature of lens of focal length -50cm--concave lens

power of lens in focal length 50 cm

p=1/f in meter

p=100/50 =2dioptre

power of lens of focal length -50cm

p=1/f in meter

same way to find power

p= - 2dioptre

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