Why can you see out, but not in, through net curtains?

Monday 1st August 2011
Submitted by mstaple
LORNA COBB, BRISTOL

Net curtains are made of white thread woven in a bold pattern. During the day, it’s much darker inside the room than on the street and the light that reflects off the curtain is much brighter than the light reflecting off objects in the room beyond. Your eye is drawn to the pattern on the curtain and this disrupts the outline of anything on the other side. From indoors, the curtains are in shadow, silhouetted against the bright scene outside and your eye finds it much easier to ignore the pattern.

GOT A QUESTION?

Scratching your head over a burning scientific conundrum? Submit your question and we'll get our esteemed panel of experts to answer it for you.

 

Why does the speed of broadband vary so much?
previous qanda Article
Do parrots have taste buds?
next qanda Article
Q&A Tabs

Yes – and many living organisms, such as fireflies, the angler fish and some jellyfish, do precisely that, via luminescence. This involves generating photons with wavelengths mainly in the...

Most animals time their reproductive season so that young are born or hatch when there is more food available and the weather isn’t so harsh. There are exceptions, though. Most dog breeds go...

Phlegm is the mucous secretion of the respiratory passages. The cilia cells that line these passages are continually driving the phlegm upward to the throat, where it triggers the swallow reflex...

At the manufacturing stage, when juice from oranges has been extracted and the pulp removed, the product is processed into two forms: not-from-concentrate (NFC) or bulk frozen concentrated orange...

The strongest teeth are natural, healthy ones and these teeth are not white. At least, not white like the colour of paper, or even the colour of piano keys. They are a couple of shades darker than...

All female mammals have a clitoris, the sole purpose of which is to react to sexual stimulation, and presumably this stimulation has evolved to be pleasurable for most species. But establishing...

To create a sound, we have to set matter - whether it's a gas like air, a liquid or even a solid material - in regular motion, creating a wave of specific frequencies, which we hear as a sound of...

Mirrors don’t reverse left and right either – that’s just our interpretation of what happens. Your reflection in the mirror is actually reversed front to back – if you have...

Discovered by an American student named Gary Flandro in the mid-1960s, the slingshot manoeuvre usually involves spacecraft briefly 'coat-tailing' a planet orbiting the Sun, extracting some of the...

The ice disappears because the wind blows away water molecules that have evaporated or 'sublimed' from the ice, so the ice slowly shrinks in size. The molecules that escape are those with the...

We use cookies to improve your experience of our website. Cookies perform functions like recognising you each time you visit and delivering advertising messages that are relevant to you. Read more here