Parallel Mirrors

Q. The figure shows two parallel plane mirrors. Object ${}^{\prime }{\text{O}}^{\prime }$ is placed $7\text{cm}$ from mirror $M_1$. Then, the distance of the final image from the mirror $M_1$ is

1. $13\text{cm}$
2. $3\text{cm}$
3. $7\text{cm}$
4. $10\text{cm}$

Q. Two plane mirrors are parallel to each other and an object $O$ is placed between them. The distance (in $\text{cm}$) of the first three images formed by the mirror $M_2$, from the mirror $M_2$ will be :

1. $5,10,15$
2. $5,15,30$
3. $5,25,35$
4. $5,15,25$

Q.

Two plane mirrors. A and B are aligned parallel to each other, as shown in

the figure. A light ray is incident at an angle of 30⁰ at a point just inside one

end of A. The plane of incidence coincides with the plane of the figure. The

maximum number of times the ray undergoes reflections (including the first

one) before it emerges out is

[IIT-JEE (Screening) 2002]

1. 28

2. 30

3. 32

4. 34

Q. In the figure you are in a system of two vertical parallel mirrors A and B separated by distance d. A point object is placed at point O, a distance 0.2d from mirror A. Each mirror produces a first (least deep) image of the object. Then each mirror produces a second image with the object being the first image in the opposite mirror. Then each mirror produces a third image with the object being the second image in the opposite mirror, and so on - you might see hundreds of images. How deep behind mirror A are the first, second, and third images in mirror A?

1. 0.2d, d and 2d
2. 0.2d, 1.8d and 2.2d
3. 0.2d, 1.6d and 2.2d
4. can′t be calculated.

Q. The figure shows two parallel plane mirrors. Object ${}^{\prime }{\text{O}}^{\prime }$ is placed $7\text{cm}$ from mirror $M_1$. Then, the distance of the final image from the mirror $M_1$ is

1. $13\text{cm}$
2. $10\text{cm}$
3. $3\text{cm}$
4. $7\text{cm}$