Lens

Question 1

u=infinity

Answer 1

inverted, real ,diminished(telescope)
Special ray diagram

Question 2

u>2f

Answer 2

inverted, real, diminished(camera)

Question 3

u=2f

Answer 3

inverted, real, same size

Question 4

f<u<2f

Answer 4

inverted, real, magnified

Question 5

u=f

Answer 5

upright, virtual, magnified
Special ray diagram(parallel light rays)

Question 6

u<f

Answer 6

upright, virtual, magnified(magnifying glass)
Special diagram (image formed behind)