physics

A tank filled with water has marks every 10 cm on one wall.

The refractive index is 1.33 for water in the tank.
You observe the marks out in air, from the opposite wall and with your eye level with the top of the water.


Which is the lowest or highest mark that you can see?

options
You can see all the marks
A) The mark at 10 cm

B)The mark at 20 cm
C)The mark at 30 cm

D)The mark at 40 cm

E)The mark at 50 cm

F)The mark at 60 cm

G)The mark at 70 cm

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asked by crystal
  1. i think it shld be B

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