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in Mathematics by (15 points)
13. A small pin is fixed on a table and it is viewed from a distance of 50 cm from above.
A glass slab of thickness 15 cm is placed just above the pin, parallel to surface to
table, then image of this pin will be viewed at what height ? Draw the sketch also.
3
Refractive index of Glassis =
2
     

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1 Answer

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by (65.0k points)

Actual depth of the pin , d=15cm
Apparent dept of the pin = d' 
′Refractive index of glass is μ=1.5
Ratio of actual depth to the apparent depth is equal to the refractive index of the glass i.e. 
μ= d/d'

⇒d' =10cm
The distance at which the pin appears to be raised = d'−d= 15−10=5cm
For a small angle of incidence, this distance does not depend upon the location of the slab.

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