For a concave (diverging) lens, what happens to a ray incident parallel to the principal axis?
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For a concave (diverging) lens, what happens to a ray incident parallel to the principal axis?

G1 Physics · Accepted Answer

Step 1: A concave lens is diverging: it bends an incident ray parallel to its principal axis away from the axis. Step 2: The backward extension of the refracted ray passes through the virtual focus on the incident side of the lens. Step 3: Under the common first-focus naming convention, that point is the first principal focus. Final answer: The ray appears to diverge from the first principal focus (Option B). Note: The source PDF discusses inconsistent F₁/F₂ labelling conventions; the physical…