The image of an object placed in air formed by a convex refracting surface is at a distance of 
behind the
surface. The image is real and is at 
of the distance of the object from the surface .The wavelength of light
inside thesurface is 
times the wavelength in air. Theradius of the curved surface is 
. the value of 
is
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30 JEE Main 2021
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