Fill in the blank
The angle of incidence for a ray of light passing through the centre of curvature of a spherical mirror is .......
Draw a ray diagram to show that the depth of a vessel containing water when seen from above, appears to be less than its real depth.
The diagram in figure shows a ray of light AO falling on a rectangular glass slab PQRS. Complete the diagram till the ray of light emerges out of the slab. Label on the diagram the incident ray, the refracted ray and the emergent ray.