which topic is most important in iit jee in ray optics

Dear prankit ,

The thing about physics is that every topic is interrelated and you just can't skip any. but nevertheless in case of ray optics focus on  

Reflection At Plane And Spherical Surfaces

Critical Angle And Total Internal Reflection

Determination of focal length of concave mirror by u–v method

Determination of focal length of convex lens using u–v method

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