Please provide the answer to this question!!!

Dear student,
As the rays coming out from other surface are parallel therefore, distance of image from refracting surface (other surface) will be:
 
V=∞
The object is stuck on one surface of transparent solid, therefore distance of object from refracting surface (other surface) will be:U = diameter 40cm
 
This is the case of refraction from concave surface (when object lies in denser medium ) for which it is given that 
 
V =∞ , U = - 40cm, R -20cm

Regards 

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