An object is located in air, 25 cm from the vertex of the concave surface of a block of glass (as viewed from the air side of the surface). The surface’s radius of curvature is 11 cm. Use these indices of refraction: nair = 1.0 and nglass = 1.5. show answer Incorrect Answer 50% Part (a) Find the refraction image distance, in centimeters. Include its sign.

Your question is missing one part as "magnification"

i have completed the missing part below

a.

b.

Explanation:

For this type of numerical we will use the following formulas

......... Eq1

where,

refractive index of the medium surrounding refracting surface/object

i.e. =  

refractive index of the refracting surface/object

i.e.

distance of object from the vertex of the refracting surface

distance of image from the vertex of the refracting surface

radius of curvature of the refracting surface

........... Eq2

where,

magnification

Convention:

Given:

=

because refraction surface is concave

Required:

a.

b.

Solution:

a. putting values in eq1, we get

cm

b.

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.