power of lens is -2 D , it's focal length is?
Answers
Answered by
1
Answer:
-50 cm
Explanation:
-2 D = 1/f ( in m )
f =-1/2 m
f = -50 cm
Answered by
1
Answer:
power=l/f
f =-1/2
=-0.5M
=-50cm
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