Categories > Ray Optics and Optical Instruments > Refraction at Curved Surface > A combination of two thin lenses with focal lengths ${{f}_{1}}$ and ${{f}_{2}}$ respectively forms an image of distant object at distance $60 cm$ when lenses are in contact. The position of this image shifts by $30 cm$ towards the combination when two lenses are separated by $10 cm$. The corresponding values of ${{f}_{1}}$ and ${{f}_{2}}$ are

Ray Optics and Optical Instruments

Question: A combination of two thin lenses with focal lengths ${{f}_{1}}$ and ${{f}_{2}}$ respectively forms an image of distant object at distance $60 cm$ when lenses are in contact. The position of this image shifts by $30 cm$ towards the combination when two lenses are separated by $10 cm$. The corresponding values of ${{f}_{1}}$ and ${{f}_{2}}$ are


1) $30 cm$,$-60 cm$
2) $20 cm$, $-30 cm$
3) $15 cm$, $-20 cm$
4) $12 cm$, $-15cm$
Solution: Explanation: No Explanation
Refraction at Curved Surface

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