How far an object should be placed from the pole of a concave mirror of focal length 20cm to form a real image whose size is 1/5 the size of the object.

The question was asked by jasleen Kaur Bhasin How far an object should be placed from the pole of a concave mirror of focal length 20 cm to form a real image whose size is 1/5 the size of the object? Can you answer this? Post the answers with necessary explanation a comment to this… Read More How far an object should be placed from the pole of a concave mirror of focal length 20cm to form a real image whose size is 1/5 the size of the object.

How was Physics exam?

Students and teachers report that this year’s CBSE Physics exam was of a different kind and many questions were quite new. How did you feel? How was CBSE Physics exam 2017? Any genuine problem cited will help while finalising the marking scheme. So, report the problems which you faced. Students, teachers and parents can post… Read More How was Physics exam?

Change in length of rubber band on cooling

Some where i read that on cooling of rubber band it expands where as when heated it contracts . Why does it happen?Full description.please   Asked Bipin Kumar Answer The rubber band actually expands when it gets colder. This occurs because of the unusual polymer structure of rubber. When the long chains get hotter and vibrate, they… Read More Change in length of rubber band on cooling