The diagram shows 2 out of the 3 possible principal rays traversing a thin lens

Question

The diagram shows 2 out of the 3 possible principal rays traversing a thin lens of unknown type. The focal points are labeled F1 and F2, the object is at O, and the image is at I Which is the correct description for the missing third principal ray? Select one: O a. From the tip of the object draw a ray toward the lens, parallel to the optical axis; as it crosses the lens it refracts going through F2. o b. From the tip of the object draw a ray through the center of the lens. As it crosses the lens it continues without changing directionn O c. From the tip of the object draw a ray through F1. As this ray crosses the lens, it emerges parallel to the optical axis o d. From the tip of the object draw a ray going through F1; as it crosses the lens it emerges going through F2. O e. From the tip of the object draw a ray going through the center of the lens and it emerges parallel to the axis.

Explanation / Answer

For the given diagram, there must be three rays to form the image-

- one ray through F1

- one ray through center of the lens

- and one ray through F2

so, the third principal ray is-

(a)

From the tip of the obect draw a ray toward the lens, parallel to the optical axis; as it crosses the lens it refracts

going through F2.

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