Q. 18

# A vessel contains

30.4 cm

when the light travels from one medium to another then its speed changes because of refractive index. Due to this it changes its path and bends by small angle. Hence when the observer observes the vessel, the height will be different from the actual height of the vessel.

Shift due to water

Shift due to oil

Total shift Δt = 5 + 4.6 = 9.6 cm

Apparent depth = 40 - (9.6) = 30.4 cm below the surface.

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