A transparent rectangular block 5.0cm thick is placed on a black dot. The dot when viewed from above is seem 3.0cm from the top of the block calculate the refractive index of the material of the block.

  • A 2/5
  • B 3/5
  • C 3/2
  • D 5/3
  • E 5/2
waec 1988physics

The correct answer is B. 3/5

refractive index = real depth ÷ apparent depth

→ 3 ÷ 5

n = 3/5

Previous question Next question