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solve the three  paragraph question given below                                                     46.a second lens is now placed adjacent to the first in contact with it.the new lens is concave with a focal lengrh f'=-3f.what is the focal length f straight f subscript tot space of space the space two space lens space system space ? treat space the space lenses space as space thin space space choose space the space options space straight a right parenthesis straight f subscript tot equals straight f over 2 space space space space space space space straight b right parenthesis straight f subscript tot fraction numerator 2 straight f over denominator 3 end fraction space space space space space space space straight c right parenthesis straight f subscript tot equals straight f space space space space space space space straight d right parenthesis straight f subscript tot equals fraction numerator 3 straight f over denominator 2 end fraction space refer space paragraph space for space next space questions......................
question image
Asked by sarveshvibrantacademy | 30 Apr, 2019, 11:29: AM
answered-by-expert Expert Answer
If the object is placed at negative infinity greater than x greater than negative f
then real and inverted image appear in region (d)
 
If the incident rays are converging then the object is virtual and image appears in the region (c)
 
If two thin lenses are put in contact,  the resultant focal length will be
1 over F equals 1 over f subscript 1 plus 1 over f subscript 2
1 over F equals 1 over f plus fraction numerator 1 over denominator negative 3 f end fraction
F equals fraction numerator 3 f over denominator 2 end fraction
Answered by Utkarsh Lokhande | 30 Apr, 2019, 14:16: PM
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