Explain reflection and shear ?

Reflection:

• It is a mirror image of an object
• Rotating about 180 degree
• Flat object moving in the xy plane
• Reflection about y axis flips x coordinates
• Reflection point as pivot point is same as above
• To obtain the transformation matrix for reflection diagonal
   is y = -x
• Sequence
• Clockwise rotation by 45 degree
• Reflection about y axis
• Counter wise rotation by 45 degree

Shear:

• Internal layer cause to slide over each other called shear 24
• Transforms coordinate position as
              X ‘= x + shx . y’ , Y’ = y
• Shift in the position of objects relative to shearing reference
lines are equivalent to translations