Numericals + Board Exam Questions

Sign Convention For Spherical Lenses

Mirror Numericals

Refraction Numerical Problems

Ray Diagrams for CONVEX MIRRORS

Lens Ray Diagrams

Convex and Concave lenses

BENDING OF THE STRAW WHEN PLACED IN A GLASS OF WATER

THIS VIDEO SHOWS THE BENDING OF LIGHT WHEN A STRAW IS PUT
IN A GLASS OF WATER. THIS IS BECAUSE THE SPEED OF LIGHT IN WATER DECREASES
AS THE MEDIUM i.e. WATER IS OPTICALLY DENSER THAN AIR.[NOTE: IT DOESNOT MEAN THE DENSITY KEEP IN MIND D= M/V, OPTICALLY DENSER MEANS
---EXAMPLE OIL IS OPTICALLY DENSER THAN WATER BUT OILS DENSITY IS LESS
THAN THAT OF WATER]

SNELL'S LAW

TO CALCULATE THE SPEED OF LIGHT IN A MEDIUM [WATER WHOSE REFRACTIVE INDEX IS 1.33. 

TRY THIS NUMERICAL PROBLEM

CACULATE THE REFRACTIVE INDEX OF A MATERIAL IF THE SPEED OF LIGHT IN THAT MEDIUM IS  2  X  10⁸  m/s.    [Ans:  1.5  refractive index has no units]