ifos • paper_1 • waves_oscillationsifos-2021-subject-02-003
Thin-lens optics — UPSC IFoS 2021 Physics PYQ
Buy PYQ Solution Manual →Two glasses have dispersive powers in the ratio 2 : 3. These glasses are used in the manufacture of an achromatic contact objective of focal length 50\text{ cm}. What are the focal lengths of the lenses ?
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