Devices Made Using Plane Mirrors

Q.

Which type of mirror is used as a rear-view mirror in cars?

1. Plane mirror
2. Convex mirror
3. Concave mirror
4. None of the above

Q. What is meant by lateral inversion? Explain it with the help of a diagram.

Q.

A polished silvery surface is a-

1. Good absorber and good reflector of heat

2. Good absorber and bad reflector of heat

3. Poor absorber and good reflector of heat

4. Poor absorber and bad reflector of heat

Q.

Name a device which is used to produce changing patterns or sequences by means of multiple reflections.

1. Periscope

2. Kaleidoscope

3. Irregular reflection

4. Both A and B

Q.

What is a periscope? Draw a neat ray diagram to show the working of a periscope?

Q. A ray of light is incident on a plane mirror at an angle of ${30}^{\circ }$ with the mirror. What is the angle between the incident and the reflected ray?

1. ${90}^{\circ }$
2. ${120}^{\circ }$
3. ${60}^{\circ }$
4. ${30}^{\circ }$

Q. Which of the following is true about a mirror?

1. It has a smooth surface.
2. It can bend the path of light rays.
3. It has a rough surface.
4. It is transparent.

Q. A __________ is an optical instrument used to produce changing colour patterns.

1. kaleidoscope
2. telescope
3. camera
4. periscope

Q.

In order to have a very wide field of view, the mirror used in cars is

1. convex

2. plane

3. concave

4. none of these

Q. Match the following:

(A) Plane mirror	(1) Always virtual, erect and dimnished image
(B) Convex mirror	(2) Image is erect and of the same size as the object
(C) Convex lens	(3) Used by dentists to see enlarged images of teeth
(D) Concave mirror	(4) Used in microscope.

Q.

Doctors use convex mirror reflectors to produce a parallel beam of light for examining body parts such as the eyes, ears, nose, and throat.

1. True
2. False

Q. An incident ray strikes a plane mirror at an angle of ${15}^{\circ }$ with the mirror. The angle between the incident ray and reflected ray (vectors) is

1. ${15}^{\circ }$
2. ${30}^{\circ }$
3. ${150}^{\circ }$
4. ${60}^o$

Q. Which mirror will you prefer to uses as a rear view mirror in a car : plane mirror or convex mirror ? Give one reason .

Q. What happens during lateral inversion?

1. The object on top will be at the bottom of the image.
2. The object on the left side will be on the left side of the image.
3. The object on the right side will be on the left side of the image.
4. The object on the right side will be on the right side of the image.

Q. State four uses of plane mirrors.

Q. One surface of a mirror is made opaque by silvering it following by a thin coat of red lead oxide paint.

1. True
2. False

Q. Write true or false for the following statements:
When a plane mirror is turned by a angle $\theta$, the reflected rays turns by an angle $\theta .$

1. True
2. False

Q.

What do you mean by lateral inversion?

Q. In a simple periscope, the two plane mirrors are to each other.

1. parallel
2. perpendicular
3. at ${45}^{\circ }$

Q. Pick the letter that undergoes lateral inversion in a plane mirror.

1. T
2. W
3. H
4. N

Q. A reflecting periscope is used by barbers to show us the back of our heads.

1. True
2. False

Q. If a ray of light is incident on a plane mirror at an angle of 30º with the mirror, what will be the angle of reflection?

1. 45º
2. 30º
3. 60º
4. 90º

Q. State two uses of a plane mirror.

Q. An object PQ is placed in front of plane mirror as shown in figure. The image distance of object from plane mirror is

1. 20 cm behind the mirror
2. 30 cm behind the mirror
3. 20 cm in front of the mirror
4. None of these

Q. We are able to see objects around us because

1. The objects absorb all the light
2. The light can be reflected
3. Light travels in straight line
4. The light reflected from the object enters our eyes

Q.

Which of the below are used for constructing a simple periscope?

1. Plane mirror

2. Concave lens

3. Convex mirror

4. Convex lens

Q. A ray of light strikes a plane mirror PQ at an angle of incidence of 30°, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is:

(a) 30°
(b) 45°
(c) 60°
(d) 90°
Draw a ray-diagram to illustrate your answer.

Q. Name the instrument in which successive reflection of light takes place from two plane mirrors.

1. Epidiascope
2. Gravimeter
3. Sextant
4. Microtome

Q.

a mirror is fitted in a wall of agra fort when u stand at a proper location a full size image of taj mahal can be seen in this mirror

what type of mirror is dis

Q. Pick the letter that undergoes lateral inversion in a plane mirror.

1. T
2. W
3. H
4. N