Question

Where do the three rays in a ray diagram start?
A. at a focal point on the opposite side of the lens
B. at three different points on the object
C. at a focal point on the same side of the lens
D. at a single point on the object

Answer 1

d is the answer

at a single point on the object

Answer 2

Answer:

The correct answer is D. at a single point on the object

Explanation:

The three rays in a ray diagram start from a single point on the object.

The three rays are called the principal rays that are used to determine the location and the size of the image. These are;

• A ray from the top of the object parallel to the principal axis and perpendicular to the lens will be refracted through the principal focal point.
• A ray that passes through the center of the lens from the top of the object, will be undeflected.
• A ray through the principal focal point from the top of the object will be refracted or proceed parallel to the principal axis upon exit from the lens.

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