Physicsmedium · Past Paper
If an object is placed 20 cm from a concave mirror of focal length 10 cm, the image is formed:
AAt 10 cm
BAt 20 cm
CAt infinity
DBetween 10 and 20 cm
✓ Correct Answer: B — At 20 cm
Since u = 20cm and f = 10cm, the object is at C (2f). The image is formed at C.
Share this question
More from Physics
- The primary purpose of earthing an electrical appliance is to:
- Shadows are formed because light:
- An object is placed at infinity from a convex lens. The image is formed at:
- Calculate the kinetic energy of a ball of mass 0.5 kg moving at a speed of 4 m/s.
- Sounds with frequencies below 20 Hz are called what?