Two things lenses of power+3.5d and -2.5d are placed in contact. Find the power and focal length of the lenses together
Answers
Answered by
1
Answer:
Explanation:
Power one of lens = P1 = +3.5D (Given)
Power two of lens = P2 = -2.5D (Given)
Power combination = P1 + P2
Thus,
Power of combination = +3.5 D +(-2.5 D )
= 3.5 D -2.5 D
= 1 D
Power = 1/focal length(m)
= 1 = 1/f
= f = 1/1
= f = 1 metre
Thus, the f of combination = 1×100 = 100 cm
Therefore, if two thin lenses of power +3.5D and -2.5D are placed in contact then the power and focal length of the lens combination will be 100m.
Similar questions