Locate the image of the point object `O`. The point `C` is centre of curvature of the spherical surface.

Explanation

Here `mu_1=1,mu_2=(4)/(3),u=-20cm,R=40cm`
`(mu_2)/(v)-(mu_1)/(u)=(mu_2-mu_1)/(R)`
`((4)/(3))/(v)=(1)/(-20)=((4)/(3)-2)/(40)`
`(4)/(3v)+(1)/(20)=(1)/(120)`
`(4)/(3v)=(1)/(120)-(1)/(20)=(-5)/(120)`
`v=(-160)/(5)=-32cm`
The image is formed 32 cm left of sphrical surface and is virtual