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When a convex lens made of glass is completely immersed in water, its focal length increases.

Assertion: When a convex lens made of glass is completely immersed in water, its focal length increases.

Reason: Refractive index of glass with respect to water is greater than that of glass with respect to air.

• (a)Both Assertion and Reason are true and Reason is the correct explanation for Assertion.
• (b)Both Assertion and Reason are true but Reason is not the correct explanation for Assertion.
• (c)Assertion is true and Reason is false.
• (d)Both Assertion and Reason are false.

Answer

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From ISC 2025 Physics Paper 1, question 1(A)(vi).