The portal has been deactivated. Please contact your portal admin.

Question Video: Determining Whether Light Rays Come From an Object That Is Distant or Nearby Science

The figure shows light rays being focused correctly by an eye. The object that the light comes from is not shown. Are the light rays from a point on a nearby object or from a point on a distant object?

01:38

Video Transcript

The following figure shows light rays being focused correctly by an eye. The object that the light comes from is not shown. Are the light rays from a point on a nearby object or from a point on a distant object? (A) The light rays are from a point on a distant object. (B) There is no way to tell. (C) The light rays are from a point on a nearby object.

This question is asking about diverging light rays entering the eye from a point on an object some distance away. It is asking us to determine if this object is nearby, distant, or if there is no way to tell.

We know that two rays of light traveling in the same direction are diverging if they move farther apart. Light rays that are converging move closer together as they travel, while light rays that are parallel neither converge nor diverge as they travel in the same direction. The two light rays entering the observer’s eye are diverging. We can construct a ray diagram showing light rays from a point on a distant object. Light from a point on a distant object will diverge. An object that is very distant will emit diverging light rays from a point.

If we zoom in on the eye in this example, we can see that over very long distances, these light rays appear parallel to each other. Light rays that are parallel must be from a point on a distant object. Since the two light rays entering our observer’s eye are diverging, option (A) cannot be the correct answer. We can construct a ray diagram showing light rays from a point on a nearby object. Light from a point on a nearby object will diverge. Since the two light rays entering our observer’s eye are also diverging, option (C) must be the correct answer.

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.