Practical One

Title: Laws of Reflection

Aim: To demonstrate that for reflection the angle of incidence is equal to the angle of reflection

Material:

Mirror, plane sheet of paper, protractor, ruler, pencil, pins, cardboard.

Diagram:

B is the angle of incidenceC is the angle of reflectionSet up your apparatus like in the diagram

Draw a straight line across the longest end of the paper. This is the reflecting line. This is so you know where to place the mirror.

Draw the normal at right angles the mirror.

Measure and draw in a ray of light at an angle of incidence of 30 degrees to the normal.

Place two pins (P1, P2) along the angle of incidence. Ensure that they are standing upright and not leaning.

Place the mirror on the reflecting line

Position yourself on the opposite side of the normal and look in the mirror, adjusting your position until the reflection of both the pins line.

Place two pins (P3, P4) in line with this reflection.

Remove the pins and draw a line to connect the points where the pins where; this is your reflected ray

Questions

Determine the angle of reflection.

Find the point behind the mirror where the virtual image of P1 is formed.

Demonstration - for those who were unable to come to class.