What is the focal length of a convex lens having power + 5.0 D ?
(A) -10 cm
(B) -20 cm
(C) + 10 cm
(D) + 20 cm
Answers
Answered by
2
relation between focal length and power is
P=100/f where focal length is in cm
=> f= 100/P
=> f= 100/5 = 20 cm
op d correct as convex lens has positive focal length.
hope it helps..
pls correct me if i m wrong...
Happy reading keep smiling
P=100/f where focal length is in cm
=> f= 100/P
=> f= 100/5 = 20 cm
op d correct as convex lens has positive focal length.
hope it helps..
pls correct me if i m wrong...
Happy reading keep smiling
Answered by
0
Answer:
so your answer is positive 20 that's +20
hope it will be helpful for you
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