Two identical glass (μg​=3/2) equi-convex lenses of focal length f are kept in contact. The space between the two lenses is filled with water (μw​=4/3). The focal length of the combination is

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Two identical glass (μg​=3/2) equi-convex lenses of focal length f are kept in contact. The space between the two lenses is filled with water (μw​=4/3). The focal length of the combination is
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Two identical glass (μg​=3/2) equi-convex lenses of focal length f are kept in contact. The space between the two lenses is filled with water (μw​=4/3). The focal length of the combination is Two identical glass (μg​=3/2) equi-convex lenses of focal length f are kept in contact. The space between the two lenses is filled with [...]
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