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Observe the picture given in figure. A sheet of some material is placed at position ‘\(P\)’, still the patch of light is obtained on the screen. What is the type of material of this sheet?
 
YCIND_220922_4494_figure_11_6.png
Experimental set-up
 
The type of material of this sheet placed at position \(P\) is a  material. This type of material to pass through them. Hence, sheet \(P\) must be a  sheet.