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In a pvc pipe two concave lens of same focal length are joined together. A boy observes moon through this pipe. How will the image of the moon look to the boy?

Mahidhar Lolla , 8 Years ago
Grade 11
anser 1 Answers
Vikas TU

Last Activity: 8 Years ago

 We can calculate the effective focal length can be calculated using this formulae =
Feff  = f1f2(f1+f2 –d)
1/ Feff = 1/ f1 + 1/ f2 – d/ f1f2
Here f1 and f2 is negative and d is positive.
f1 = f2 = -ve = -f
Since d = 0
Then effective focal length will be = -f/2
Then using the lens formulae
  • 1/f =1/v-1/u
Then from this  v =-f/2
Hence the image is virtual, erect and diminshed

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