| A | B |
| PHOTO | LIGHT |
| PHOTOCOPY | A PAPER COPY OF A DOCUMENT OR PICTURE THAT IS MADE WITH A SPECIAL MACHINE. |
| PHOTOGRAPH | A PICTURE MADE BY A CAMERA. |
| PHOTON | A TINY PARTICLE OF LIGHT OR ELECTROMAGNETIC RADIATION. |
| PHOTOSYNTHESIS | THE PROCESS BY WHICH A GREEN PLANT TURNS WATER AND CARBON DIOXIDE INTO FOOD WHEN THE PLANT IS EXPOSED TO LIGHT. |
| TELEPHOTO | A LENS FOR A CAMERA THAT MAKES FAR AWAY OBJECTS APPEAR TO BE CLOSER. |
| IM-, IN-, IL- | NOT |
| INCAPABLE | NOT ABLE TO DO SOMETHING; NOT HAVING THE NECESSARY SKILL OR ABILITY TO PERFORM A SPECIFIC ACT OR FUNCTION. |
| INELIGIBLE | NOT ALLOWED TO DO OR BE SOMETHING; LEGALLY DISQUALIFIED. |
| IMBALANCE | A STATE OR CONDITION IN WHICH DIFFERENT THINGS DO NOT OCCUR IN EQUAL OR PROPER AMOUNTS. |
| ILLITERATE | NOT KNOWING HOW TO READ OR WRITE; HAVING OR SHOWING A LACK OF KNOWLEDGE ABOUT A PARTICULAR SUBJECT. |
| ILLOGICAL | NOT THINKING ABOUT THINGS IN A REASONABLE OR SENSIBLE WAY; UNREASONING. |