Question

A car is fitted with a convex mirror of focal length $20cm$. A second car $2m$ broad and $1.6m$ high is $6m$ away from the first car. The position of the second car as seen in the mirror of the first car is

• A. $19.35cm$
• B. $17.45cm$
• C. $21.48cm$
• D. $15.49cm$

Answer 1

Answer: (A)

$19.35cm$

$\frac{1}{v}+\frac{1}{-600}=\frac{1}{20}$
or $\frac{1}{v}=\frac{31}{600}$
or $v=\frac{600}{31}cm=19.35cm$.