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CBSE Class 10 Answered

please can u further explain the two different formulaes in the answer cause i still did not understand the answer to my previous question as follows a lens of focal length f is cut into two equal parts without affecting its curvature. the two pieces will have equal focal length of ________ can u explain the answer as follows 1/F=1/f+1/f F=f/2 1/f=1/f'+1/f' f'=2f
Asked by Rida Mukadam | 28 Feb, 2015, 01:55: PM
Expert Answer
 
 
begin mathsize 14px style straight A space lens space of space focal space length space straight f space is space cut space into space two space equal space parts space without space affecting space its space curvature. space Each space part space will space have space focal space length space straight f comma space then space resultant space focal space length space will space be comma 1 over straight F space equals space 1 over straight f space plus space 1 over straight f rightwards double arrow space straight F space equals space straight f over 2   end style
 
 
begin mathsize 14px style When space space lens space is space cut space as space shown space in space above space figure space then comma space each space part space wil space have space focal space length space straight f apostrophe space then space resultant space focal space length comma space space 1 over straight f space equals space fraction numerator 1 over denominator straight f apostrophe end fraction space plus space fraction numerator 1 over denominator straight f apostrophe end fraction straight f apostrophe space equals space 2 straight f Hence comma space each space part space will space have space focal space length space 2 straight f end style
Answered by Priyanka Kumbhar | 02 Mar, 2015, 11:40: AM
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