Calculating the Total Number of Images

Q.

How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?

Q.

If two mirrors are kept inclined to each other at an angle of 60 degrees, the number of images of the object formed is:

1. Remains the same

2. Large

3. Small

4. Large or small epending on the person's age

Q.

If two plane mirrors are kept inclined to each other at an angle of 60 degrees, the number of images of the object formed is:

1. Large

2. Small

3. Remains the same

4. Large or small epending on the person's age

Q.

Two plane mirrors are set at right angles to each other. A coin is placed in-between these two plane mirrors. How many images of the coin will be seen?

Q. An object is kept between two plane mirrors inclined at an angle $120$ from each other; calculate the ratio of number of images which are formed if the object is not on the angle bisector to the number of images formed if object is on the bisector?

1. $\frac{3}{2}$
2. $\frac{2}{3}$
3. $\frac{2}{2}$
4. $\frac{3}{3}$

Q.

As the angle between two plane mirrors is decreased gradually, the number of images of an object placed between them:

(a) increases gradually

(b) decreases gradually

(c) first increases then decreases

(d) first decreases then increases

Q.

How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?

1. 2

2. 0

3. 1

4. infinite

Q.

Explain why the intensity of images keeps on decreasing when multiple reflections take place.

Q.

How many images of an object will be formed when the object is placed between two plane mirrors which are inclined at the following angles to one another?

(a) ${120}^{\circ }$ (b) ${45}^{\circ }$ (c) ${180}^{\circ }$ (d) ${60}^{\circ }$ (e) ${90}^{\circ }$

Q.

The number of images formed of an object placed between two plane mirrors inclined at right angles to each other is:

(a) two

(b) five

(c) one

(d) three

Q.

What will be the number of images formed when an object is placed between two parallel plane mirrors facing each other ?

Q. Two mirrors are inclined at an angle ${120}^0$, an object is placed asymmetrically between them. Then number of images formed will be:

1. 1
2. 2
3. 4
4. 3

Q. If an object is placed symmetrically between two plane mirrors inclined at an angle of ${72}^{\circ }$, then the total number of images formed is:

1. $5$
2. $4$
3. $2$
4. Infinite

Q.

Question 20 (b)

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.



Indicate the positions of the mirrors in the figure.

Q.

Why are infinite images not seen when two plane mirrors are facing each other.

Q. If an object is placed symmetrically between two plane mirrors, inclined at an angle of ${72}^0$, then the total number of images formed is:

1. 5
2. 4
3. 2
4. Infinite

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 $\left(M_2\right)$ parallel to the first mirror $\left(M_1\right)$. The angle between the two mirrors will be :

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

Q.

How to find out Noor images in multiple reflection?

Q.

Two plane mirrors are inclined at $ {70}^{\circ }$. A ray incident on one mirror at an angle $ \theta $, after reflection, falls on the second mirror and is reflected from there parallel to the first mirror. The value of $ \theta $ is:

Q.

Total number of images formed by 2 mirrors placed at an angle of $\theta$ is $\left(\frac{{360}^{\circ }}{\theta }\right)$, where $\theta$ is the angle between two mirrors.

1. True

2. False

Q. Two plane mirrors are at right angles to each other. A man stands between them and combs his hair with his right hand. How many of the images will be formed:

1. $2$
2. $1$
3. $3$
4. None

Q. If an object is placed between two mirrors held perpendicular to each other. Then number of images formed is

1. $3$
2. $4$
3. $5$
4. $2$

Q. A plane mirror makes an angle of ${30}^o$ with the horizontal. If a vertical ray strikes the mirror. Find the angle between the mirror and the reflected ray?

Q. Assertion: If the angle between the two plane mirror is ${72}^o$ and the object is asymmetrically placed between the two mirrors, then 5 images of the object will be formed.
Reason: For a given system of mirrors the total number of images formed due to successive reflection is equal to either $\frac{{360}^o}{\theta }$ or $\frac{{360}^o}{\theta }-1$ accordingly as $\frac{{360}^o}{\theta }$ is odd or even respectively.

1. If both Assertion 'and Reason are correct and Reason is the correct explanation of Assertion
2. If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion
3. If Assertion is correct but Reason is incorrect
4. If Assertion is incorrect but Reason is correct

Q. An object is placed (1) asymmetrically (2) symmetrically, between two plane mirrors inclined at an angle of 50°. Find the number of images formed

Q. Match the number of images formed by two plane mirrors with the corresponding angle between them, when the object is placed symmetrically between them.

1. 5
2. 2
3. 3
4. 1

Q. Describe an experiment to verify the laws of reflection of light

Q. Match the following:

Q. A person goes to a jewellery shop and as he enters the shop he finds his three images. How are the mirrors arranged in the jewellery shop?

1. Parallel to each other.
2. Perpendicular to each other.
3. At angle ${60}^{\circ }$ to each other
4. At angle ${120}^{\circ }$ to each oother

Q. Two plane mirrors are placed such they make $0^{\circ }$ angle with each other. How many images, of an object placed between them, are formed?

1. $0$
2. $2$
3. $Infinite$
4. $1$