search
arrow-left Previous
Next arrow-right
Q: To obtain a virtual and erect image by reflection from a concave mirror of focal length 20 cm, the object should be placed :
  • A. at zero
  • B. between 0-20 cm
  • C. between 20-40 cm
  • D. at 20 cm
Correct Answer: Option B - To obtain a virtual and erect image 'by reflection from a concave mirror of focal length 20cm, the length of object should be placed between 0-20 cm. Focal length is the distance between the pole and the principal focus.
B. To obtain a virtual and erect image 'by reflection from a concave mirror of focal length 20cm, the length of object should be placed between 0-20 cm. Focal length is the distance between the pole and the principal focus.

Explanations:

To obtain a virtual and erect image 'by reflection from a concave mirror of focal length 20cm, the length of object should be placed between 0-20 cm. Focal length is the distance between the pole and the principal focus.