From which point of a lens are all the distances measured?

  • A
    Focus
  • B
    Optical centre
  • C
    Centre of curvature
  • D
    Aperture

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Similar Questions

The velocity of light in air is $3 \times 10^{8} \, m \, s^{-1}$. What is the velocity of light in water? (The absolute refractive index of water is $\frac{4}{3}$.)

Name the type of lens that can be used as a magnifying glass. Give reason$(s)$ and draw a ray diagram to support your answer.

What happens when an oblique ray of light enters from glass into air?

Draw ray diagrams showing the image formation by a convex mirror when an object is placed:
$(a)$ at infinity
$(b)$ at a finite distance from the mirror

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