Mirrors

Q. What is the magnification of a plane mirror?

1. $1$
2. $0$
3. $2$
4. $-1$

Q.

Define reflection and refraction of light

Q.

Two mirrors A and B are placed at right angles to each other as shown in the figure.




A ray of light incident on mirror A at an angle of ${25}^{\circ }$ falls on mirror B after reflection. The angle of reflection for the ray reflected from mirror B would be

1. ${100}^{\circ }$

2. ${50}^{\circ }$

3. ${65}^{\circ }$

4. ${25}^{\circ }$

Q.

What do you mean by diffused light

Q.

Question 12

The angle between incident ray and reflected ray is ${60}^{\circ }$. What is the value of angle of incidence? Given that, angle of incidence + angle of reflection=${60}^{\circ }$.

Q.

A small hole P is made in a piece of cardboard. The hole is illuminated by a torch as shown in the figure. The pencil of light coming out of the hole falls on a mirror. Torch and point 'A' are equidistant from 'C'.



At which point should the eye be placed, so that the hole can be seen?

1. $A$

2. $B$

3. $C$

4. $D$

Q.

Show that if a ray of light is reflected successively from two mirrors inclined at an angle $\theta$ , the deviation of the ray does not depend upon the angle of incidence. [5 MARKS]

Q.

The ray of light that bounces off the mirror is called _______ (incident ray/ reflected ray)

Q. For a mirror, the angle of the incidence is 60 degrees. Then, what will be the angle of reflection?

1. 90°
2. 45°
3. 30°
4. 60°

Q. An image A is formed on a screen. A plane mirror is placed in front of the screen, to capture the image of A. Let's call it B. Which of the following is true?

1. Both the images (A and B) are real
2. Both the images (A and B) are virtual
3. Image A is real, whereas image B is virtual.
4. Image A is virtual, whereas image B is real

Q.

Question 20 (c)

Boojho planned an activity to observe an object A through pipes as shown in figure, so that he could see objects which he could not directly see.



What must be the angle with respect to the incident light at which he should place the mirrors?

Q.

Consider two rooms of same size, a normal brick walled room and the other room full of mirrors. If the same lamp is placed in both the rooms, then which room will have more brightness and why? [2 MARKS]

Q.

Which among the following is true for a plane mirror?

1. Angle of incidence is the angle between incident ray and the mirror surface.

2. Angle of incidence is not always equal to angle of reflection.

3. Angle of incidence is the angle between the reflected ray and the incident ray.

4. Angle of incidence is always equal to angle of reflection.

Q.

The angle of incidence is,

Q. An object is placed symmetrically between the two plane mirrors inclined at angle of ${30}^o$. Then the total number of images formed is:

1. 12
2. 2
3. 11
4. 15

Q.

If a ray of light is incident at an angle of $60°$ to the normal, then the angle formed by the reflected ray with the normal is equal to_______.

Q. Two plane mirror are inclined to each other such that a ray of light incident on the first mirror $\left(M_1\right)$ and parallel to the second mirror $\left(M_2\right)$ is finally reflected form th second mirror $\left(M_2\right)$ parallel to the first mirror $\left(M_1\right)$ the angle between the two mirrors will be :

1. ${60}^0$
2. ${75}^0$
3. ${90}^0$
4. ${45}^0$

Q.

If '$i$' represents the angle of incidence and '$r$' represents the angle of reflection, then which of the following option(s) is true?

1. Yes

2. No

3. Maybe

4. Can't be said

Q. A ray of light is incident on a plane mirror at an angle of 30${}^o$. At what angle with the horizontal must a plane mirror be placed so that the reflected ray becomes vertically upwards?

1. 40${}^o$
2. 60${}^o$
3. 30${}^o$
4. 20${}^o$

Q.

Light is falling on surfaces $S_1,S_2,and{S}_3$ as shown in the figure.




Surfaces on which the angle of incidence is equal to the angle of reflection is/are

1. Only $S_1$

2. $S_{1}and{S}_2$

3. $S_{2}and{S}_3$

4. All the three surfaces

Q. Which one of the following is the best reflector of light ?

1. wood
2. pencil
3. wall
4. plane mirror

Q. a particle is moving in front of a plane mirror as shown in figure. Velocity of image with respect to object is -

1. $Vsin\theta$
2. $Vcos\theta$
3. $2Vsin\theta$
4. $2Vcos\theta$

Q.

$\left(a\right)$ Find out the position of the image of an object situated at $A$ in the plane mirror.
$\left(b\right)$ Can paheli at $B$ see this image?
$\left(c\right)$ Can Boojho at $C$ see this image?
$\left(d\right)$ When paheli moves from $B$ to $C$, where those the image of $A$ move?

Q.

After reflection from a mirrors ray of light is know as

1. Reflected ray

2. Normal

3. Incident ray

4. Refracted ray

Q. Two plane mirrors are placed perpendicular to each other. A ray of light strikes the first mirror and after reflection from the first mirror it falls on the second mirror. Assuming that the final reflected ray is in the plane of the incident ray, the final reflected ray emerges:

1. Perpendicular to the original ray
2. At ${60}^{\circ }$ to the original ray
3. At ${45}^{\circ }$ to the original ray
4. Parallel to the original ray

Q. Two plane mirrors A and B are aligned parallel to each other, as shown in figure. A light ray is incident at an angle $30$ 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:

1. $28$
2. $30$
3. $32$
4. $34$

Q. What kind of mirror is required for obtaining a virtual image of the same size as the object?

Q.

Suppose the angle of incidence is $X^0$. Then angle between Shweta and Garima in terms of $X^0$ can be represented as:

1. (2X-4)⁰

2. (2X+4)⁰

3. (X+4)⁰

4. (X-4)⁰

Q. Two plane mirrors are inclined to each other such that a ray of light incident on the first mirror $\left(M_1\right)$ and parallel to the second mirror $\left(M_2\right)$ is finally reflected from the second mirror $\left(M_1\right)$ parallel to the two mirroes will be :

1. ${90}^0$
2. ${75}^0$
3. ${45}^0$
4. ${60}^0$

Q.

A small object is placed 10cm in front of a plane mirror. If you stand behind the object 30 cm from the object and look at its image, the distance focused for your eye will be :

1. $40cm$
2. $80cm$
3. $60cm$
4. $20cm$