13. A small pin is fixed on a table and it is viewed from a distance o

1.	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. 3Refractive index of Glassis = 2     
Answer» 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.

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. 3Refractive index of Glassis = 2     

Answer»

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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