CBSE Class 12-science Physics Total Internal Reflection

• how do optical fibres transmit light without absorption
• please help
  
• When a ray of light travels from rarer to denser medium, can the angle of refraction in denser medium be more than the critical angle for the given pair of media?
• the refracive index of a glass  is 1.5. A sphere of this glass  is immersed in water having refractive index as 4/3 .The critical angle for light rays originating within the sphere
• What is Total Internal Reflection? State two conditions which should be fulfilled for this phenomena.
• Why is it that the images formed by total internal reflection are brighter than those formed by mirrors or lenses?
• What is critical angle?
• State the uses of optical fibres.
• What will be the value of critical angle for total internal reflectionof light travelling from glass into water. Given
• Why or how does a diamond sparkle more than a transparent material like glass cut out in same shape?

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