① I can't see the whiteboard because of the reflection.
② I can't see the writing on the whiteboard because of the glare.
こんにちは^^
「光が反射して見えない」ですね？
① I can't see the whiteboard because of the reflection (of the light).
※ reflection 反射
② I can't see the writing on the whiteboard because of the glare.
※ the writing on the whiteboard 板書
※ glare 眩しさ
こんな感じでいかがでしょうか？^^
アダム先生＆ミチコ先生
アメリカ合衆国 
