Optics Question 618

Question: Two lenses have focal lengths f1 and f2 and their dispersive powers are ω1 and ω2 respectively. They will together form an achromatic combination if

Options:

A) ω1f1=ω2f2

B) ω1f2+ω2f1=0

C) ω1+f1=ω2+f2

D) ω1f1=ω2f2

Show Answer

Answer:

Correct Answer: B

Solution:

For achromatic combination, w1f1+w2f2=0

Therefore w1f2+w2f1=0



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