TIME REMAIN
43:20
Roshan makes the table below to describe how to draw a ray diagram for a convex lens.
Ray from Object to Lens
Draw through the focal point on the
same side of the lens as the object.
Draw parallel with the main axis
After Passing Through Lens
The ray goes parallel to the main axis.
The ray goes away from the main axis as
though it came from the focal point near the
object
The ray goes straight through and does not
bend
Draw to the center of the lens
What error did Roshan make?
The ray that goes through the senter should bend and go through the focal point on the other side.
The ray that starts out parallel with the main axis should bend toward the axis and go through the focal point on the other
side.
The ray that goes parallel to the main axis after passing through the lens should also be parallel from the object to the lens.
The rays in the table describe how rays are drawn for a concave lens rather than for a convex lens.