Optics Question 904

Question: The focal length of a concave mirror is $ 50cm. $ Where an object be placed so that its image is two times and inverted

Options:

A) 75 cm

B) 72 cm

C) 63 cm

D) 50 cm

Show Answer

Answer:

Correct Answer: A

Solution:

For real image m = ? 2, so by using $ m=\frac{f}{f-u} $

$ \Rightarrow -\ 2=\frac{-50}{-50-u}\Rightarrow u=-\ 75\ cm $



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