Question

write all the conditions to see an object

Answer 1

the most important condition is that light rays must be coming from that object....!!
#Hope it helps!@:D

Answer 2

1. Light to be precise a visible range of spectrum if naked eyes, or any kinda range with equipments like thermal imaging cameras for infrared radiations or ultraviolet cameras

2. Perfect luminosity of light

3. Eyes should be open, brain should be functioning enough energy to visualise

4. It should not be a patient of any optical disorders

5. There is a gradual change in the environment and the object eg black board and chalk to see, but if there is a black chalk and black board we won't be able to see

6. Perfect synchronisation of time .