Physics, asked by auz019672, 7 months ago

1. A convex lens of focal length f produces a virtual image n time of the object. The distance of object is:
(a) (n+1/n)f
(b) (n-1/n)f
(c) (n+1)f
(d) (n-1)f
please just do step by step solution​

Answers

Answered by ummadichanakya2007
2

Answer:

option b is your answer

Explanation:

focal length = +f  object size = h_o image size = n h_o

magnification = \frac{n h_o}{h_o}=\frac{v}{u}

⇒v= n u

\frac{1}{f} =\frac{1}{v} -\frac{1}{u}

\frac{1}{f}  = \frac{1}{nu}  - \frac{1}{u}

\frac{1}{f} = \frac{-1}{u}(\frac{1}{n}-1)

u = \frac{-(n-1)f}{n}

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