Sitting in her parlour one night, Chitra sees the reflection of her cat in the livingroom window. If the image of her cat makes an angle of 40^o with the normal,at what angle does Chitra see the reflected image of the cat?

Which part of the human eye helps in changing the focal length of the eye lens?

A pencil partly immersed in water in a glass tumbler appears to be bent at the interface of air and water. Name the phenomenon of light responsible for it.

Why do the lines of the magnetic field not cross each other?

What is the magnetic field midway between two parallel conductors carrying same amount of current in the same direction and in the opposite direction?