naturally occurring optical phenomenon

MIRAGE
List of words for the clue naturally occurring optical phenomenon from the crossword:
LENS FIBER ELNINO SPORADIC HORAL ERODE ORGANIC INHERE DYED ALONE INHERENT RARE ONESHOT TIDE REM PRISM LASER ECHO PRONE
WordClue
EVENTphenomenon
FIBERoptical or nerve
LASERoptical device
RAYONcellulose-based synthetic fiber
CAMERAoptical device
BOILINGbulk phenomenon
MONOCLEcorrective lens
RAINBOWoptical phenomenon
CROWDINGvisual phenomenon
OBSIDIANnaturally occurring volcanic glass
PERISCOPEoptical device
PETROLEUMnaturally occurring flammable liquid
PROJECTORoptical device
TELESCOPEoptical device
WHIRLWINDweather phenomenon
BINOCULARSoptical device
MICROSCOPEoptical device
SLIPSTREAMfluid dynamics phenomenon
THEODOLITEoptical device
REFRACTOMETERoptical device
PETROLEUMnaturally occurring flammable liquid
OBSIDIANnaturally occurring volcanic glass