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-rwxr-xr-x1172/CH1/EX1.7/1_7.txt7
-rwxr-xr-x1172/CH1/EX1.7/Example1_7.sce17
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+# Problem 7 #
+
+ Standard formula used
+ beta= lambda*D/d.
+
+ Vertex angle of biprism is 177.575948 degree.
+
diff --git a/1172/CH1/EX1.7/Example1_7.sce b/1172/CH1/EX1.7/Example1_7.sce
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+clc
+//Given that
+mu=1.52// refractive index of plane glass prism
+theta=%pi/180// angle of prism
+y1=25// separation between slit and biprism in cm
+y2=175//separation between biprism and screen in cm
+lambda=0.000055// wavelength of incident light in cm
+beta=0.02//fringe width in cm
+//Sample Problem 7 Page No. 49
+printf("\n # Problem 7 # \n")
+printf(" \n Standard formula used \n beta= lambda*D/d. \n")
+D=y1+y2
+d= (D*lambda)/beta
+theta=d/(2*(mu-1)*y1)
+vertex_angle=180-(2*theta*180/%pi)
+printf("\n Vertex angle of biprism is %f degree.",vertex_angle)
+