A glass slab of thickness 3 cm and refractive index $\frac{3}{2}$ cm is placed above an ink mark on a piece of paper. For a person looking at the mark at a distance 5.0 cm above it, the distance of the mark will appear to be

3.0 cm

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4.0 cm

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4.5 cm

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5.0 cm

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Solution

The correct option is B
4.0 cm

The apparent depth of ink mark = $\frac{r e a d d e p t h}{μ}$
$= \frac{3}{\frac{3}{2}} = 2 c m$

Thus, person mark is at a distance = 2+

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A glass slab of thickness 3 cm and refractive index $\frac{3}{2}$ cm is placed above an ink mark on a piece of paper. For a person looking at the mark at a distance 5.0 cm above it, the distance of the mark will appear to be

The correct option is B
4.0 cm

The apparent depth of ink mark = $\frac{r e a d d e p t h}{μ}$
$= \frac{3}{\frac{3}{2}} = 2 c m$

Thus, person mark is at a distance = 2+