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Refraction through a Lens — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsRefraction through a Lens1 Mark
MCQ
The power of a lens is + 1.0 D is : ________ .
  • A
    convex of focal length 1.0 cm
  • ✓
    convex of focal length 1.0 m
  • C
    concave of focal length 1.0 cm
  • D
    concave of focal length 1.0 m
✓

Answer

Correct option: B.
convex of focal length 1.0 m
Power of a lens is $+1.0 D$. The positive sign indicates that the focal length of the lens is positive which indicates the lens is a convex lens.
Power is $P=\frac{1}{f(\text { in } m)}$
$+1.0 D =\frac{1}{ f (\text { in } m )}$
$
\therefore f =1.0 m
$
Hence, the correct answer is convex of focal length $1.0 m$.

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