Thomas Alva Edison invented the practical incandescent light bulb in 1879. He also invented phonograph. Tesla contributed to AC system. Faraday electromagnetic induction. Bell telephone.
Explanation:
Lens maker's formula: 1/f = (μ_lens/μ_medium - 1)(...). In water, relative refractive index reduces, so power decreases, focal length increases. Glass in water behaves less converging.
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