Question

An object 5cm tall is placed 1m from a concave spherical mirror which has a radius of curvature of 20 cm. The size of the image is

• A. 0.11 cm
• B. 0.50 cm
• C. 0.55 cm
• D. 0.60 cm

Answer 1

Answer: (C)

0.55 cm

Answer 2

h_o = 5 cm

f = – $\frac { \mathrm { R } } { 2 }$ = – 10 cm

u = – 1 m = – 100 cm

h_i = ?

m = = –

h_i = – h_o­ = – 5 $\left[ \frac { - 10 } { - 100 + 10 } \right]$

= $\frac { 50 } { - 90 }$ = – $\frac { 5 } { 9 }$ cm = – 0.55 cm