2 files changed, 12 insertions, 0 deletions
diff --git a/3411/CH7/EX7.4.u1/Ex7_4_u1.sce b/3411/CH7/EX7.4.u1/Ex7_4_u1.sce
new file mode 100644
index 000000000..dfde2872d
--- /dev/null
+++ b/3411/CH7/EX7.4.u1/Ex7_4_u1.sce
@@ -0,0 +1,10 @@
+//Example 7_4_u1
+clc();
+clear;
+//To calculate the numerical apperture and angle of acceptance
+n1=1.45
+n2=1.40
+NA=sqrt(n1^2-n2^2)
+printf("Numerical apperture is NA=%.3f\n",NA)
+ia=asin(NA)*180/%pi             //units in degrees
+printf("Angle of acceptance is ia=%.2f Degrees",ia)
diff --git a/3411/CH7/EX7.4.u1/Ex7_4_u1.txt b/3411/CH7/EX7.4.u1/Ex7_4_u1.txt
new file mode 100644
index 000000000..9e2eac112
--- /dev/null
+++ b/3411/CH7/EX7.4.u1/Ex7_4_u1.txt
@@ -0,0 +1,2 @@
+ Numerical apperture is NA=0.377
+Angle of acceptance is ia=22.18 Degrees 
+\ No newline at end of file