Topics from September 2017 What are the different types of mirrors? Posted by Keshav Jain on Friday, September 15. 2017 Why do forward moving wheels sometimes appear turning backwards? Posted by Keshav Jain on Thursday, September 14. 2017 What are the contact lenses? Posted by Keshav Jain on Saturday, September 9. 2017 What is a shadow? Posted by Keshav Jain on Saturday, September 9. 2017 What is a Range Finder? Posted by Keshav Jain on Saturday, September 9. 2017 What is the refraction of light? Posted by Keshav Jain on Saturday, September 9. 2017 What is light? Posted by Keshav Jain on Friday, September 8. 2017