10 files changed, 109 insertions, 0 deletions
diff --git a/3769/CH21/EX21.1/Ex21_1.sce b/3769/CH21/EX21.1/Ex21_1.sce
new file mode 100644
index 000000000..48e3670b7
--- /dev/null
+++ b/3769/CH21/EX21.1/Ex21_1.sce
@@ -0,0 +1,11 @@
+clear
+//Goven
+d=5*10**-3                             //m
+D=1.0                                   //m
+b=0.1092*10**-3
+
+//Calculation
+l=(d*b)/D
+
+//Result
+printf("\n Wavelength of light used is %0.3f  A", l*10**10)
diff --git a/3769/CH21/EX21.10/Ex21_10.sce b/3769/CH21/EX21.10/Ex21_10.sce
new file mode 100644
index 000000000..cd6ffaf9e
--- /dev/null
+++ b/3769/CH21/EX21.10/Ex21_10.sce
@@ -0,0 +1,10 @@
+clear
+//Given
+Imax=121
+Imin=81.0
+
+//Calculation
+a=Imax/Imin
+
+//Result
+printf("\n The ratio of intensity at the maxima and minima is %0.2f  ",a)
diff --git a/3769/CH21/EX21.13/Ex21_13.sce b/3769/CH21/EX21.13/Ex21_13.sce
new file mode 100644
index 000000000..d32cd7ffc
--- /dev/null
+++ b/3769/CH21/EX21.13/Ex21_13.sce
@@ -0,0 +1,10 @@
+clear
+//Given
+l=5.0                         //m
+d=1                              //mm
+
+//Calculation
+a=d/l
+
+//Result
+printf("\n Width of each slit is %0.3f  mm", a)
diff --git a/3769/CH21/EX21.2/Ex21_2.sce b/3769/CH21/EX21.2/Ex21_2.sce
new file mode 100644
index 000000000..7f4a7b9d7
--- /dev/null
+++ b/3769/CH21/EX21.2/Ex21_2.sce
@@ -0,0 +1,11 @@
+clear
+//Given
+l=6200*10**-10                   //m
+D=0.8
+b=2.8*10**-3/4.0
+
+//Calculation
+d=(l*D)/b
+
+//Result
+printf("\n Separation of the two slit is %0.1f  mm",d*10**3)
diff --git a/3769/CH21/EX21.3/Ex21_3.sce b/3769/CH21/EX21.3/Ex21_3.sce
new file mode 100644
index 000000000..41bcd25f8
--- /dev/null
+++ b/3769/CH21/EX21.3/Ex21_3.sce
@@ -0,0 +1,11 @@
+clear
+//Given
+a=62
+l=5893
+l1=4358.0
+
+//Calculation
+n=(a*l)/l1
+
+//Result
+printf("\n Fringes required is %0.0f  ",n)
diff --git a/3769/CH21/EX21.4/Ex21_4.sce b/3769/CH21/EX21.4/Ex21_4.sce
new file mode 100644
index 000000000..e33b53416
--- /dev/null
+++ b/3769/CH21/EX21.4/Ex21_4.sce
@@ -0,0 +1,13 @@
+clear
+//Given
+l=6000*10**-10                       //m
+D=0.800                               //m
+d=0.200*10**-3                         //m
+
+//Calculation
+x2=(3*l*D)/(2.0*d)
+x21=(2*D*l)/d
+
+//Result
+printf("\n (i) Distance of the second dark fringe is %0.3f  cm", x2*10**2)
+printf("\n (ii) Distance of the second dark fringe is %0.3f  cm", x21*10**2)
diff --git a/3769/CH21/EX21.6/Ex21_6.sce b/3769/CH21/EX21.6/Ex21_6.sce
new file mode 100644
index 000000000..543e3e941
--- /dev/null
+++ b/3769/CH21/EX21.6/Ex21_6.sce
@@ -0,0 +1,10 @@
+clear
+//Given
+Imax=16
+Imin=4
+
+//Calculation
+r=Imax/Imin
+
+//Result
+printf("\n Deduce the ratio of intensity is %0.3f  :1", r)
diff --git a/3769/CH21/EX21.7/Ex21_7.sce b/3769/CH21/EX21.7/Ex21_7.sce
new file mode 100644
index 000000000..3904c1b31
--- /dev/null
+++ b/3769/CH21/EX21.7/Ex21_7.sce
@@ -0,0 +1,10 @@
+clear
+//Given
+b=2
+u=1.33
+
+//Calculation
+b1=b/u
+
+//Result
+printf("\n Fringe width is %0.1f  mm",b1)
diff --git a/3769/CH21/EX21.8/Ex21_8.sce b/3769/CH21/EX21.8/Ex21_8.sce
new file mode 100644
index 000000000..abafdda0a
--- /dev/null
+++ b/3769/CH21/EX21.8/Ex21_8.sce
@@ -0,0 +1,11 @@
+clear
+//Given
+b2=0.4
+b1=0.6
+l1=5000
+
+//Calculation
+l2=(b2*2*l1)/b1
+
+//Result
+printf("\n Wavelength of the light is %0.0f  A",l2)
diff --git a/3769/CH21/EX21.9/Ex21_9.sce b/3769/CH21/EX21.9/Ex21_9.sce
new file mode 100644
index 000000000..f533aa630
--- /dev/null
+++ b/3769/CH21/EX21.9/Ex21_9.sce
@@ -0,0 +1,12 @@
+clear
+//Given
+d=0.125*10**-3                     //m
+l=4500*10**-10                      //m
+D=1                                 //m
+
+//Calculation
+x2=(2*D*l)/d
+d1=2*x2
+
+//Result
+printf("\n Separation between the fringes is %0.3f  mm", d1*10**3)