Which phenomenon accounts for an object underwater appearing closer to the surface than it actually is?

• A. Refraction
• B. Reflection
• C. Diffraction
• D. Absorption

Answer: (A)

Light bending at the boundary between water and air causes this illusion. Light travels more slowly in water than in air, and when it crosses the surface it changes direction and bends away from the normal. Because your eye tracks the light in a straight line, your brain interprets it as coming from a point closer to the surface, making the object seem shallower than it really is. This effect follows Snell’s law and is why the underwater object appears nearer to the surface.

Reflection would show a mirrored image at the surface, not a shifted depth. Diffraction involves bending of waves around obstacles or through openings, not the apparent depth of a submerged object. Absorption changes brightness or color, not the perceived position of the object.