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+// A Texbook on POWER SYSTEM ENGINEERING
+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar
+// DHANPAT RAI & Co.
+// SECOND EDITION 
+
+// PART IV : UTILIZATION AND TRACTION
+// CHAPTER 4: ILLUMINATION
+
+// EXAMPLE : 4.2 :
+// Page number 753
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+lumens = 800.0        // Flux emitted by a lamp(lumens)
+cp = 100.0            // cp of a lamp
+d = 2.0               // Distance b/w plane surface & lamp(m)
+theta_ii = 45.0       // Inclined surface(°)
+theta_iii = 90.0      // Parallel rays(°)
+
+// Calculations
+// Case(a)
+mscp = lumens/(4.0*%pi)            // mscp of lamp
+// Case(b)
+I_i = cp/d**2                      // Illumination on the surface when it is normal(lux)
+I_ii = cp/d**2*cosd(theta_ii)      // Illumination on the surface when it is inclined to 45°(lux)
+I_iii = cp/d**2*cosd(theta_iii)    // Illumination on the surface when it is parallel to rays(lux)
+
+// Results
+disp("PART IV - EXAMPLE : 4.2 : SOLUTION :-")
+printf("\nCase(a): mscp of the lamp, mscp = %.f ", mscp)
+printf("\nCase(b): Case(i)  : Illumination on the surface when it is normal, I = %.f lux", I_i)
+printf("\n         Case(ii) : Illumination on the surface when it is inclined to 45°, I = %.3f lux", I_ii)
+printf("\n         Case(iii): Illumination on the surface when it is parallel to rays, I = %.f lux\n", abs(I_iii))
+printf("\nNOTE: ERROR: Calculation mistake in case(a) in textbook solution")