Thanks for adding me to your friend list! :)

hey thank you for adding really amazing work ..
could you plz use 5 mins limits for your videos length ..
its really very useful but u know we need something speed and short :) ..lazy people :D
thank you again

Thank you for the invite my new friend! Nice meet you!

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very informative! nice work.

Came by to bless the page. Stay Healthy

Hello!
Thank you so much for inviting me. :)

A lens is an optical device with perfect or approximate axial symmetry which transmits and refracts light, converging or diverging the beam.[citation needed] A simple lens consists of a single optical element. A compound lens is an array of simple lenses (elements) with a common axis; the use of multiple elements allows more optical aberrations to be corrected than is possible with a single element. Lenses are typically made of glass or transparent plastic. Elements which refract electromagnetic radiation outside the visual spectrum are also called lenses: for instance, a microwave lens can be made from paraffin wax.