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
A
80cm
B
40cm
C
50cm
D
70cm
Verified Correct Answer: B.
Physical Principles & Numerical Solution
An object is placed 15 cm 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.
Source: Myschool Past Questions Archive (Record #44666)