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Light – Reflection and Refraction — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceLight – Reflection and Refraction1 Mark
MCQ
According to New Cartesian Sign Convention :
  • A
    Focal length of concave mirror is positive and that of convex mirror is negative.
  • B
    Focal length of both concave and convex mirrors is positive.
  • C
    Focal length of both concave and convex mirrors is negative.
  • ✓
    Focal length of concave mirror is negative and that of convex mirror is positive.
✓

Answer

Correct option: D.
Focal length of concave mirror is negative and that of convex mirror is positive.
This is because the focus of a concave mirror is in front of the mirror, on the left side, and the focus of a convex mirror is behind the mirror, on the right side.

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