Ray Optics and ...

Laws of refraction to hold good:

Due to refraction,

A virtual image occurs when light rays appear to converge. One example of the formation of a virtual image is 

When an object is placed under a transparent medium, it appears to be raised. The upward shift = 

The refractive index of a medium:

Given a trace of light, refractive index of the medium can be found by using:

Second law of refraction is also called:

Refraction of light can take place at boundary of

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?