Question

A boy with a 10 cm long stick is standing 2 m away from a plane mirror. How long is the image of the stick?

• A. 40 cm
• B. 20 cm
• C. 5 cm
• D. 10 cm

Answer 1

The correct option is D 10 cm

Answer is D.
The characteristic of plane mirror images is that the dimensions of the image are the same as the dimensions of the object. If a 1.6-meter tall person stands in front of a mirror, he/she will see an image that is 1.6-meters tall. If a penny with a diameter of 18-mm is placed in front of a plane mirror, the image of the penny has a diameter of 18 mm.
In this case, a boy with a 10 cm long stick is standing 2 m away from a plane mirror.
Therefore, the length of the image of the stick will also be 10 cm only.