A sunshine recorder globe of 30 cm diameter is made of glass 
. A ray enter the globe parallel to the axis. Find the position where the ray crosses the axis
A
4.5 cm from the point 
of the globe
of the globe B
7.5 cm from the point 
of the globe
of the globe C
5 cm from the point 
of the globe
of the globe D
15 cm from the point 
of the globe
of the globe
Text Solution
Verified by ExpertsThe correct answer is:
B
Radius of curvature of the first surface is +15 cm and 
For the second surface, point 
is the virtual object
At the second surface, the ray passes from a denser to a rarer medium and 
∴ The ray crosses the axis at a point 
which is 7.5 cm from the Point 
of the globe.
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