In the lens equation, the variable do represents the distance of the object from

the distance of the object from the centre of the lens

Explanation:

The lens equation is the following:

where

f is the focal length of the lens

is the distance between the object and the centre of the lens

is the distance between the image and the centre of the lens

Therefore, the variable representes the distance of the object from the centre of the lens.

sleep paralysis is a parasomnia, events associated with sleep.

sleep paralysis happens when you are in the middle of waking up or falling asleep. it is the feeling of being conscious but unable to move. it definitely involves hallucinations.

i had a friend that had sleep paralysis and he told me a story one time where he was laying in bed and he couldn't move his body no matter how hard he tried and there was someone standing in the corner of his room coming towards him. he couldn't move and you can't "wake up" because you are already conscious. sometimes sleep paralysis can be triggered by frequent waking up during the night based off of multiple trips to the bathroom, or if you had ever been abused, sleep paralysis can start happening from things like that.

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