Changes

#Activity No #1 [[Concave and convex lenses]]

#Activity No #1 [[Concave and convex lenses]]

#Activity No #2 [[Refraction of light]]

#Activity No #2 [[Refraction of light]]

#Activity No #2 [[convex lens at different object distances]]

#Activity No #3 [[convex lens at different object distances]]

#Activity No #3 [[creation of a rainbow in a glass]]

==Concept #2==

==Concept #2==