Object or image distance when a convex lens or concave mirror forms a real image n times the object

1. A.
   $(n-1)f$
2. B.
   $\frac{n-1}{n}f$
3. C.
   $\frac{n+1}{n}f$
4. D.
   $(n+1)f$

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1. A.
   0.5 f
2. B.
   0.66 f
3. C.
   f
4. D.
   1.5 f

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1. A.
   $\frac{n+1}{n}f$
2. B.
   $f\left(1-\frac{1}{n}\right)$
3. C.
   $\frac{nf}{n+1}$
4. D.
   $f\left(1+\frac{1}{n}\right)$

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1. A.
   $F(m-1)$
2. B.
   $(m-1)F$
3. C.
   $F(m+1)$
4. D.
   $\frac{F}{(m-1)}$

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1. A.
   0.5 m
2. B.
   0 .166 m
3. C.
   0.33 m
4. D.
   1 m

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1. A.
   $\dfrac{F}{(n + 1)}$
2. B.
   $\dfrac{F}{(n - 1)}$
3. C.
   $F(n - 1)$
4. D.
   $F(n + 1)$

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