Question

There is a point object and a plane mirror. If the mirror is moved by 10 cm away from the object, find the distance which the image will move.

Answer 1

According to the question,

Given

$\Delta x_o=0$

$\Delta x_m=10$

We know that,

$X_{im}=-X_{om}$

or, $X_i-X_m=X_m-X_o$

or $\Delta x_i-\Delta x_m=\Delta x_m-\Delta x_o$

So here we have,

$\Delta x_o=0$

$\Delta x_m=10$

since $\Delta x=2\Delta x_m-\Delta x_o$

$=20cm$

Hence, the distance which the image is moved is $=20cm$