5.
A thin convex lens of focal length 20 cm is
placed in closed contact with a thin concave
lens of focal length 5 cm. The power of
combination is
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Answer:
Explanation:
Focal of convex lens(f)=+20cm=20/100=+.20m
44P=1/f=1/.20=100/20=+5D$$
focal length of concave lens(f)=−10cm=−10/100=−.1m
P=1/−.1=−10D
power of combination=5−10=−5D
hence,
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