JAMB - Physics (2016 - No. 7)
An object is placed 15cm in front of a plane mirror. If the mirror is moved further 5cm away from the object and the image is
80cm
40cm
50cm
70cm
Giải thích
An object is placed 15 cm15 \, \text{cm}15cm in front of a plane mirror.
Initial Image Position: The image is 15 cm behind the mirror.
Mirror Movement: The mirror is moved 5 cm further away from the object, making the distance to the mirror 20 cm.
New Image Position: The new image is now also 20cm behind the mirror.
Conclusion
The total distance from the object to the image is 20 cm + 20 cm = 40 cm.