Question

Why we are unable to see the object in a room for some time when we enter the room from an open ground​

Answer 1

the pupil of eye takes some time to adjust the amount of light to pass from more to less.

Answer 2

because the pupil of our eye has become small in light area or area where there is so much of light and it takes time,to adjust the pupil or adjust its focal length in other words power of accomodation.