Category: Physics

A:  hot
B:  luminescent
C:  radium
D:  excited 

A:  convex lens
B:  concave lens 
C:  concave mirror
D:   concave-convex lens

A:  plane mirror
B:  spherical mirror
C:  convex lens 
D:  concave lens

A:  Survey research
B:  Ethnographic
C:  Interview research
D:  Co-relational research

A:  Hypothesis
B:  Interpretion
C:  Discussions
D:  Investigations