# Atal Tinkering Labs ATL

## Simple Introduction to the Arduino

In this simple tutorial we will take you step by step through the process of writing your first arduino microcontroller program. The program will blink an LED on the circuit board.

## ” A physics workshop for students of Delhi Public School ” by Prof Arthur Eisenkraft

A physics workshop for students of Delhi Public School, East, Bangalore by Prof Arthur Eisenkraft . 12th Jan 2017.   About Speaker : Arthur Eisenkraft, PhD, is one of America’s leading science educators. For 25 years, he taught high school physics and was a 6-12 science coordinator. He was past president of the National Science Teacher Association and was chair of the Science Academic Advisory Committee of the College Board. He is project director of the NSF-supported Active Physics curriculum project that is introducing physics instruction for the first time to all students and leading a similar effort with Active…

## Human Eye

The human eye belongs to a general group of eyes found in nature called “camera-type eyes.” Instead of film, the human eye focuses light onto a light sensitive membrane called the retina.   The cornea is a transparent structure found in the very front of the eye that helps to focus incoming light. Behind the cornea is a colored ring-shaped membrane called the iris. The iris has an adjustable circular opening called the pupil, which can expand or contract depending on the amount of light entering the eye.

## Spherical Mirrors

The image formed by any mirror is located either where the reflected light converges, or where the reflected light appears to diverge from.   A spherical mirror is simply a piece cut out of a reflective sphere. Its center of curvature, C, is the center of the sphere it was cut from. R, the mirror’s radius of curvature is the radius of the sphere. The focal point F (the point where parallel rays are focused) is located half the distance from the mirror to the center of curvature. The focal length, f, is: focal length of a spherical mirror :…

## Reflection of Sound

Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves.   When sound travels in a given medium, it strikes the surface of another medium and bounces back in some other direction, this phenomenon is called the reflection of sound. The waves are called the incident and reflected sound waves.   First Law of Reflection: The incident wave, the reflected wave, and the normal at the point of incidence lie on…