AP EAMCET · PHYSICS · Ray Optics
The focal length of a lens of dispersive power 0.45 which should be placed in contact with a convex lens of focal length \(84 \mathrm{~cm}\) and dispersive power 0.21 to make the achromatic combination from the two lenses, in \(\mathrm{cm}\) is
- A 45
- B 90
- C 180
- D -180
Answer & Solution
Correct Answer
(D) -180
Step-by-step Solution
Detailed explanation
Here, \(\quad \omega_1=0.45\) \(\omega_2=0.21\) and \(f_2=84 \mathrm{~cm}\) As the lens are kept is contact it is achromatic condition.…
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