Numerical answer
A coin lies at the bottom of a layer of water deep () covered by a flat glass slab thick (), which rests on the water. Viewed almost normally from air above, the coin appears to be at a depth (in cm, below the top of the glass) of
Show answer and solution
Answer: 10
For near-normal viewing, each layer contributes real thickness divided by its refractive index (relative to the medium above it, the final medium being air). Glass: . Water: . The apparent depth below the top surface is . The coin therefore appears nearer than its actual .
Saved on this device. Sign in or create a free account to keep it on every device.