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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)
+