Physicsmedium · Past Paper
A lens of power +2.5 D is used by a person. What is the type of defect and the focal length?
AMyopia, -40 cm
BHypermetropia, +40 cm
CMyopia, +40 cm
DHypermetropia, -40 cm
✓ Correct Answer: B — Hypermetropia, +40 cm
Positive power indicates a convex lens used for Hypermetropia. f = 1/2.5 = 0.4 m = 40 cm.
Share this question
More from Physics
- If the mass of the earth is M and its radius is R, the acceleration due to gravity g is given by:
- The ratio of displacement to distance for a moving object is:
- The work done to rotate a dipole in an electric field depends on:
- A boy of mass 50 kg climbs a staircase of height 10 m. What is the work done by him against gravity? (g = 10 m/s^2)
- Momentum of a body of mass 5 kg moving with 10 m/s is: