Mathematics · Wave Optics
Two lenses have dispersive powers in the ratio 2 : 3. These glasses are used to make an achromatic lens combination of focal length 20 cm. The focal lengths of the two individual lenses are:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1f1 = 10 cm, f2 = -10 cm
- 2f1 = 6.67 cm, f2 = -10 cm✓
- 3f1 = -10 cm, f2 = 10 cm
- 4f1 = 5 cm, f2 = -10 cm
Correct answer
f1 = 6.67 cm, f2 = -10 cm
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