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
- Which of the following materials has a negative temperature coefficient of resistance?
- If two plane mirrors are kept at an angle of 60 degrees to each other, the number of images formed is:
- Galton's whistle is used to produce which type of sound?
- What happens to the wavelength of a sound wave if its frequency is doubled while keeping speed constant?
- A resistor has a resistance of 5 Ohms. If a potential difference of 10 Volts is applied across it, what is the current?