A fish is 30 cm below the water surface in a still pond. What is its apparent depth from the water surface if viewed from top? Take the refractive index of water to be $\frac{4}{3} .$

20.5 c m

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22.5 c m

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40 c m

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20 c m

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Solution

The correct option is C $22.5 c m$
Real depth $= 30 c m$

$μ = \frac{4}{3}$

Apparent depth $= ?$

$μ = \frac{R e a l d e p t h}{A p p a r e n t d e p t h}$

Apparent depth

$= \frac{R e a l d e p t h}{μ} = \frac{30 \times 3}{4} = \frac{90}{4} c m$
or 22.5 cm

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A fish is 30 cm below the water surface in a still pond. What is its apparent depth from the water surface if viewed from top? Take the refractive index of water to be 43.

The correct option is C 22.5cmReal depth =30cmμ=43Apparent depth =?μ=Real depthApparent depthApparent depth=Realdepthμ=30×34=904cmor 22.5 cm

A fish is 30 cm below the water surface in a still pond. What is its apparent depth from the water surface if viewed from top? Take the refractive index of water to be $\frac{4}{3} .$

The correct option is C $22.5 c m$
Real depth $= 30 c m$

$μ = \frac{4}{3}$

Apparent depth $= ?$

$μ = \frac{R e a l d e p t h}{A p p a r e n t d e p t h}$

Apparent depth

$= \frac{R e a l d e p t h}{μ} = \frac{30 \times 3}{4} = \frac{90}{4} c m$
or 22.5 cm