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Light – Reflection and Refraction — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceLight – Reflection and Refraction1 Mark
MCQ
An optical device has been given to a student and he determines its focal length by focusing the image of the sun on a screen placed $24\ cm$ from the device on the same side as the sun. Select the correct statement about the device.
  • A
    Convex mirror of focal length $12\ cm.$
  • B
    Convex lens of focal length $24\ cm.$
  • ✓
    Concave mirror of focal length $24\ cm.$
  • D
    Convex lens of focal length $12\ cm.$
✓

Answer

Correct option: C.
Concave mirror of focal length $24\ cm.$

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