the focal length of a concave lens of 4D power will be ??
Answers
Answered by
1
Ans is 25 cm
Explanation
Power = 4D
P= 1/f
F= 1/4
= 0.25
F = 25
Explanation
Power = 4D
P= 1/f
F= 1/4
= 0.25
F = 25
Similar questions