$\sqrt{2}$. A ray of light strikes the surface **AB** as shown in the figure. After refraction it is incident on a spherical surface **CD** of radius of curvature **0.4 m** and enters medium of refractive index **1.514** to meet **PQ** at **E**. Find the distance **OE**.

Find the answer upto

two decimal places.All measurement are in

meters.Refractive index on the right side of the glass slab is

1.514.The ray initially is in

vacuum.