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I have a doubt, kindly clarify. Two lenses of power –15 D and +5 D are incontact with each other. The focal length of thecombination is

Two lenses of power –15 D and +5 D are in
contact with each other. The focal length of the
combination is

  • Option 1)

    +10cm

  • Option 2)

    -20cm

  • Option 3)

    -10cm

  • Option 4)

    +20cm

 
Answers (1)
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Option 1)

+10cm

Option 2)

-20cm

Option 3)

-10cm

Option 4)

+20cm

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