Two thin lenses with focal lengths f_1 and f_2 have materials with dispersive powers \omega_1 and \omega_2 respectively. Then to form an achromatic combination of these lenses, essential condition is that

Correct Answer is : ω1f1+ω2f2=0

\frac{\omega_1}{f_1}-\frac{\omega_2}{f_2}=0

\frac{\omega_1}{f_1}+\frac{\omega_2}{f_2}=0

CUSAT 2022 BTech Solved Paper Shift 4

Question : 45 of 200

Marks: +1, -0

Two thin lenses with focal lengths f1 and f2 have materials with dispersive powers ω1 and ω2 respectively. Then to form an achromatic combination of these lenses, essential condition is that

‌
ω1
f1
−‌
ω2
f2
=0
‌
ω1
f1
+‌
ω2
f2
=0
ω1+ω2=0
f1+f2=0

Validate

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