Question

A vehicle has a driving mirror of focal length 30 cm. Another vehicle of dimensions 2 × 4 × 1.75 m³ is 9 m away from the mirror of first vehicle. Position of the second vehicle as seen in the mirror of first vehicle is nearly –

• A. 30 cm
• B. 60 cm
• C. 90 cm
• D. 9 m

Answer 1

Answer: (A)

30 cm

Answer 2

$\frac { 1 } { - 900 }$ + $\frac { 1 } { \mathrm { v } }$ = $\frac { 1 } { 30 }$

$\frac { 1 } { \mathrm { v } }$ = $\frac { 31 } { 900 }$ , v = $\simeq$30 cm