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Why can a lace curtain be seen through by day from inside but not from outside?

  1. Myn Is Me profile image70
    Myn Is Meposted 6 years ago

    Why can a lace curtain be seen through by day from inside but not from outside?

    https://usercontent2.hubstatic.com/6443371_f260.jpg

  2. Viviannie profile image81
    Viviannieposted 6 years ago

    There are two causes for that.
    One is because of the difference in luminosity, outside being brighter than inside.

    The second cause is the keyhole effect. When you look from inside to outside, you are closer to the curtain and you can see more. When you look from outside the distance from you to the curtain is greater and you cannot see very clear.
    The two effects combined give you more privacy.

  3. carol2050 profile image55
    carol2050posted 6 years ago

    The whiteness of the lace reflects the sunlight and causes pupils to contract to keep too much glare out of your eyes and this makes it difficult to see through the tiny dark openings in the lace. The reverse is true at night. It is easy to see inside while it is nearly impossible to see the anything in the dark outside.

  4. Mr Knowitall profile image70
    Mr Knowitallposted 6 years ago

    The curtain does not reflect enough light from its inner side to interfere with the much stronger light reflected from objects out of doors. On the other hand, its outer surface is much more strongly lit than things inside the room, and the light reflected from it overcomes the light reflected from them.

 
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