When tha concave lens of refractive index 1.5 (ng = 1.5) is immersed in a midium of refractive index 1.65 (nm = 1.65), the lens begins to behave as a converging (convex) lens.
Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Session 2024-2025.
Q.23. A concave lens of refractive index 1.5 is immersed in a medium of refractive index 1.65. What is the nature of the lens?
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When a concave lens (n = 1.5) is immersed in a medium with a higher refractive index (n = 1.65), it behaves as a convex lens, as the medium bends light more strongly than the lens.
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