DIRECTION:Put a check if the object is an opaque material and cross out if not.
[tex] \normalsize \underline{ \sf{✔}} \normalsize{ \sf{1.wall}}[/tex]
[tex] \normalsize \underline{ \sf{✔}} \normalsize{ \sf{2.curtain}}[/tex]
[tex] \normalsize \underline{ \sf{✔}} \normalsize{ \sf \: {3.tree}}[/tex]
[tex] \normalsize \underline{ \sf{✔}} \normalsize{ \sf \: {4.umbrella}}[/tex]
[tex] \normalsize \underline{ \sf{X}} \normalsize{ \sf \: {5.window \: pane}}[/tex]
ت