A concave mirror has radius of curvature of 
. It is at the bottom of a glass that has water filled up to 
(see figure). If a small particle is floating on the surface of water, its image as seen, from directly above the glass, is at a distance 
from the surface of water. The value of 
is close to : (Refractive index of water 
)
Text Solution
Verified by ExpertsB
Light incident from particle 
will be reflected at mirror.
This image will act as object for light getting refracted at water surface.
So, object distance 
Below water surface.
After refraction, final image is at
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