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Light – Reflection and Refraction — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceLight – Reflection and Refraction1 Mark
MCQ
Study the following diagram and select the correct statement about the device $'X\ ' :$
  • A
    Device $'X\ '$ is a concave mirror of radius of curvature $12\ cm.$
  • B
    Device $'X\ '$ is a concave mirror of focal length $6\ cm.$
  • ✓
    Device $'X\ '$ is a concave mirror of focal length $12\ cm.$
  • D
    Device $'X\ ' $is a convex mirror of focal length $12\ cm.$
✓

Answer

Correct option: C.
Device $'X\ '$ is a concave mirror of focal length $12\ cm.$
From the figure, we can see that the light rays coming from infinity get reflected by the device $'X\ '$ and converge at a point at a distance $12\ cm$ from it. Therefore, the device $'X\ '$ is a concave mirror of focal length $12\ cm.$

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