From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 1949/CH1/EX1.20.1/1_20_1.sce | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100755 1949/CH1/EX1.20.1/1_20_1.sce

(limited to '1949/CH1/EX1.20.1/1_20_1.sce')

diff --git a/1949/CH1/EX1.20.1/1_20_1.sce b/1949/CH1/EX1.20.1/1_20_1.sce
new file mode 100755
index 000000000..a37375d21
--- /dev/null
+++ b/1949/CH1/EX1.20.1/1_20_1.sce
@@ -0,0 +1,21 @@
+//Chapter-1,Example 1_20_1,Page 1-52
+clc()
+
+//Given Data:
+i=45*%pi/180         //angle of incidence
+u=1.2                //Refractive index of a film
+t=4*10^-7            //thickness of film
+
+//Calculations:
+//u=sin i/sin r      //Snell's law   .So,
+r=asin(sin(i)/u)     //angle of reflection
+
+//Now, condition for dark fringe is
+//2ut*cos r=n*lam
+lam1=2*u*t*cos(r)/1          //n=1
+printf('For n=1 wavelength is =%.10f m \n',lam1)
+printf(' This is in the visible spectrum and it will remain absent.\n \n') 
+
+lam2=2*u*t*cos(r)/2          //n=2
+printf(' For n=2 wavelength is =%.10f m \n',lam2)
+printf(' This is not in the visible spectrum \n \n')
-- 
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