ICSE Class 10 Answered
How to find the focal length of combination of lens
Asked by lovemaan5500 | 07 Jan, 2018, 06:58: AM
Expert Answer
Power of concave lens = 100/20 = 5 D
Power of convexs lens = -100/30 D
Power of combined lens = (100/20) - (100/30) D = 100/60 D
focal length of combined lens = 60 cm
Answered by | 07 Jan, 2018, 12:44: PM
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