Which of the following statement is/are correct?
- The space between the walls of a Dewar flask or thermos bottle is evacuated to reduce conduction and convection losses.
- In a simple microscope, when an object is at a distance less than the focal length of the lens, the image obtained is virtual, erect and magnified.
1
1 only
2
2 only
3
1 and 2 both
4
None of the above