Focus of a Concave Lens

Q.

The focal length of the concave lens is taken as negative.

1. False

2. True

Q.

New sign convention for convex lens are

1. Real object distance is positive

2. Real object distance is negative

3. Focal length is positive

4. Focal length is negative

Q. Where will these parallel rays meet/appear to meet after refraction from concave lens?

1. $F_2$
2. $F_1$
3. $2F_2$
4. $2F_1$

Q.

Which of these has virtual focus?

1. concave lens

2. convex lens

3. convex mirror

4. both (a) and (b)