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In the figure shown here, what is the equivalent focal length of the combination of lenses (Assume that all layers are thin)?

 

Option 1 -

a

Option 2 -

b

Option 3 -

c

Option 4 -

d

0 6 Views | Posted a month ago
Asked by Shiksha User

  • 1 Answer

  • R

    Answered by

    Raj Pandey | Contributor-Level 9

    a month ago
    Correct Option - 4


    Detailed Solution:

    1 f 1 = ( 1.6 - 1 ) 1 ∞ - 1 20 = - 3 100

    1 f 2 = ( 1.5 - 1 ) 1 20 - 1 - 20 = 1 20

    1 f 3 = 1 f 1 = - 3 100

    1 f net   = 1 f 1 + 1 f 2 + 1 f 3

    = - 3 50 + 1 20

    ⇒ f n e t = - 100 c m

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