A double convex air bubble in water behaves as (a) convergent lens (b) divergent lens (c) plane slab (d) concave mirror

Answer: (b). Lens maker's formula in a medium: 1/f = (μlensμmedium - 1)(1/R₁ - 1/R₂) For an air bubble in water μlensμmedium = 1/1.33 < 1, so f is negative for a convex shape. So the answer is (b) divergent lens.

A double convex air bubble in water behaves as | MHT CET 2023 (10 May, Shift 1)

Q50MHT CET 2023 · 10 MAY · SHIFT 1Easy

Spherical Surfaces & Thin Lenses

A double convex air bubble in water behaves as

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Answer: (b)

Lens maker's formula in a medium: $\frac{1}{f} = \left(\frac{\mu_{lens}}{\mu_{medium}} - 1\right)\left(\frac{1}{R_1} - \frac{1}{R_2}\right)$
For an air bubble in water $\frac{\mu_{lens}}{\mu_{medium}} = \frac{1}{1.33} < 1$ , so $f$ is negative for a convex shape.
So the answer is (b) divergent lens.

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