You are presented with the question "What is used to perceieve light inside the pupil" and the following answer choices: 
- an electron lens
 - It expands
 - Receptor Cells
 - heat energy
 - Energy.
 - focusing a lens
 - sensory neurons
 - observe it

Now knowing that when light enters the eye through the pupil , that light falls on the retina and receptors are cells in the retina that perceive light, choose the best answer.


 

   Receptor Cells      