Question

Make a solar heater / cooker and explain the process of making. 

(OR) 

Which cooker uses solar energy to cook food and explain its making? 

(OR)

 Explain the construction and working of a solar cooker.

Answer 1

Construction:

1.  Make a wooden / iron frame in dish shape. It is solar cooker. 
2.  Cut the acrylic mirror sheets into 8 or 12 pieces in the shape of isosceles triangles with a height equal to the radius of a dish antenna. 
3.  The bases of 8 or 12 triangles together make the circumference of the dish. 
4.  Stick the triangle mirrors to the dish as shown in figure. 
5.  Thus solar heater/cooker is ready.

Working: 

1.  Face it towards the sun. 
2.  Find its focal point and place a vessel at that point. 
3.  It will get heated. Everyone cook rice in that vessel.