Aberrations; a lecture in Optics. 4

Optical systems are studied under two assumptions

object point does not lie far away from the axis of the optical system.

rays taking part in image formation make a small angle with the axis of the optical system.

The domain of optics where above two assumptions are valid is called as Paraxial optics. Paraxial systems are highly idealized and in reality do not perfectly represent the situation. The consequential errors in image reconstruction are known as aberrations.
The paraxial assumption can be represented by truncating at the first term of the polynomial expansion of the sin function by the Maclaurin series. More…

Why are women from Venus. Reply

Amazing #Astronomy fact; Years are faster than day, for Venus, why are women from Venus.

There is only one planet in our solar system which rotates opposite to how all other planets rotate. You guess it right, Venus. Explains why women are from Venus.

You don’t get that? Its a very strange planet. The planet where the length of the year is shorter than one single day. Thats right, it takes earth to complete 225 days for Venus to complete 1 year. But it takes earth to complete 243 days for Venus to complete 1 day. Years are faster than day, for Venus. And nobody (other planets) is that slower than Venus. Give your women their time, they need to be slow.

More women are from Venus facts;

There are more volcanoes on Venus than on any other planet in the solar system. Astronomers know of more than 1,600 volcanoes on its surface More…