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Answer Form Experimental Problem No. 1 Diode laser wavelength Task 1.1 Experimental setup. (0.75) 1.1 Sketch the laser path in drawing of Task 1.1 and Write down the height h of the beam as measured from the table h ± ∆ h = 5.0 ± 0.05 ( 29 × 10 - 2 m (0.25) 1.0

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Experimental setup for measurement of diode laser wavelength Task 1.2 Expressions for optical path differences.
1.2 The path differences are Case I: (0.25) I ( n ) = ( BF + FP ) - BP = ( L b - L 0 ) + L 0 2 + L R 2 ( n ) - L b 2 + L R 2 ( n ) = ( L b - L 0 ) + L 0 1 + L R 2 ( n ) L 0 2 - L b 1 + L R 2 ( n ) L b 2 using 1 + x 1 + 1 2 x ( L b - L 0 ) + L 0 1 + 1 2 L R 2 ( n ) L 0 2 - L b 1 + 1 2 L R 2 ( n ) L b 2 I ( n ) 1 2 L R 2 ( n ) 1 L 0 - 1 L b Case II: (0.25) II ( n ) = ( FB + BP ) - FP = ( L 0 - L a ) + L a 2 + L L 2 ( n ) - L 0 2 + L L 2 ( n ) ( L 0 - L a ) + L a 1 + L L 2 ( n ) L a 2 - L 0 1 + L L 2 ( n ) L 0 2 using 1 + x 1 + 1 2 x ( L 0 - L a ) + L a 1 + 1 2 L L 2 ( n ) L a 2 - L 0 1 + 1 2 L L 2 ( n ) L 0 2 II ( n ) 1 2 L L 2 ( n ) 1 L a - 1 L 0 0.5

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Task 1.3 Measuring the dark fringe positions and locations of the blade . Use additional sheets if necessary.
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