Question

A substance is behaving as convex lens in air and concave in water, then its refractive index should be

• A. Smaller than air
• B. Greater than both air and water
• C. Greater than air but less than water
• D. Almost equal to water

Answer 1

Answer: (C)

Greater than air but less than water

If a substance changes its nature in water, then $\mu$ of water must be greater than that of the substance.