A transparent rectangular block 5.0cm thick is placed on a black dot. The dot when viewed from above is seem 3.0cm from the top of the block calculate the refractive index of the material of the block.

The change of the direction of a wave-front because of a change in the velocity of the wave in another medium is called?

The image of an object is located 6cm behind a convex mirror. If its magnification is 0.6, calculate the focal length of the mirror

A ray of light passing through the centre of curvature of a concave mirror is reflected by the mirror at?

From the diagram, the correct equation for the refractive index n of the medium is