Physicshard · Past Paper
A person can see objects clearly only between 50 cm and 200 cm. What lens is required to see distant objects?
AConvex, f = 50 cm
BConcave, f = 200 cm
CConcave, f = 50 cm
DConvex, f = 200 cm
✓ Correct Answer: B — Concave, f = 200 cm
To see distant objects (u=infinity), the far point must be shifted. Using lens formula for v = -200cm gives f = -200cm (concave).
Share this question
More from Physics
- Thrust per unit area is called:
- The velocity of a particle at any time t is given by v = 2t(3-t). At what time is the velocity maximum?
- A stone is dropped into a well 44.1m deep. The sound of splash is heard 3.13s later. The velocity of sound is:
- In a series circuit of three identical resistors, the total power dissipated is P. If they are reconnected in parallel to the same source, the total power will be:
- A ball is dropped from a building and reaches the ground in 3s. What is the height of the building? (g = 10 m/s^2)