Question:
In a concave lens, a ray of light emanating from the object parallel to the principal axis of the lens, after refraction: ____.
In a concave lens, a ray of light emanating from the object parallel to the principal axis of the lens, after refraction: ____.
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Concave lens = Diverging (appears to come from F). Convex lens = Converging (actually passes through F).
Updated On: May 4, 2026
- passes through the second principal focus.
- appears to diverge from the first principal focus.
- emerges parallel to the principal axis.
- passes through 2F, which is the radius of curvature of the lens.
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
A concave lens is a diverging lens. It spreads out parallel rays of light.
Step 2: Detailed Explanation:
1. When a ray parallel to the principal axis strikes a concave lens, it is refracted away from the axis. 2. If we trace this refracted ray backward, it passes through the principal focus ($F$) on the same side as the object. 3. Therefore, to an observer on the other side, the light "appears to diverge" from the focus.
Step 3: Final Answer:
The ray appears to diverge from the first principal focus.
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