A coin is placed next to the convex side of a thin spherical glass shell having

Question

A coin is placed next to the convex side of a thin spherical glass shell having a radius of curvature of 19.0cm . An image of the 1.5?cm?tall coin is formed 5.50cm behind the glass shell.

Part A

Where is the coin located?

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A coin is placed next to the convex side of a thin spherical glass shell having a radius of curvature of 19.0cm . An image of the 1.5?cm?tall coin is formed 5.50cm behind the glass shell.

Part A

Where is the coin located?

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Explanation / Answer

r = 18cm
f = r/2 = 9.5cm
s' = 5.5cm
h = 1.5cm

A: Object distance is s so...
From the lens equation: 1/f = 1/s + 1/s'
Get to... s = (f * s') / (f - s') =(9.5*5.5)/(4)=13.0625 cm

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