Physics-
General
Easy

Question

Three right angled prisms of refractive indices n subscript 1 end subscript comma n subscript 2 end subscript and n subscript 3 end subscript are fixed together using an optical glue as shown in figure. If a ray passes through the prisms without suffering any deviation, then

  1. n subscript 1 end subscript equals n subscript 2 end subscript equals n subscript 3 end subscript    
  2. n subscript 1 end subscript equals n subscript 2 end subscript not equal to n subscript 3 end subscript    
  3. 1 plus n subscript 1 end subscript equals n subscript 2 end subscript plus n subscript 3 end subscript    
  4. 1 plus n subscript 2 end subscript superscript 2 end superscript equals n subscript 1 end subscript superscript 2 end superscript plus n subscript 3 end subscript superscript 2 end superscript    

The correct answer is: 1 plus n subscript 2 end subscript superscript 2 end superscript equals n subscript 1 end subscript superscript 2 end superscript plus n subscript 3 end subscript superscript 2 end superscript

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