Two converging lenses are placed together with the focal lengths 15 cm and 30 cm respectively. Calculate the total power.
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Two converging lenses are placed together with the focal lengths 15 cm and 30 cm respectively. Calculate the total power.
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Explanation:
F1 = 15cm, f2 = 30cm
Focal length of combination,
1/f=1/f1+1/f2
1/f= 1/15+1/30
1/f= (15+30)/(15*30)
f = 450/45
f= 10cm
4.0
Answer:
Explanation:
COMBINED FOCAL LENGTH F OF TWO LENSES OF FOCAL LENGTHS f 1 AND f 2 is given by
1/F = 1/f 1 + 1/f 2
F = f 1 *f 2 /f 1+ f 2
if f 1= 15 cm and f 2 = 30 cm then we get F 10 cm
hence power = 100 /10 = 10 D