Image of an Extended Object in Plane Mirror

Q. When a plane mirror is placed horizontally on level ground at a distance of $60\text{m}$ from the foot of a tower, the top of the tower and its image in the mirror subtends an angle of ${90}^{\circ }$ at the corner of the mirror nearer to the foot of tower. The height of the tower is

1. $30\text{m}$
2. $60\text{m}$
3. $90\text{m}$
4. $120\text{m}$

Q.

A person's eye is at a height of 1.5m. He stands in front of a 0.3m long plane mirror whose lower end is 0.8m above the ground. The length of the image he sees himself is?

Q. A small object is placed $10\text{cm}$ in front of a plane mirror. If you stand behind the object $30\text{cm}$ from the mirror and look at its image, the distance between the observer and the image of the object will be

1. $60\text{cm}$
2. $20\text{cm}$
3. $40\text{cm}$
4. $80\text{cm}$

Q.

Show Camphors chiral centre.

Q. Assertion : A virtual image can not be obtained on a screen.
Reason : Two plane mirrors placed parallel to each other, will form infinite virtual images for a real object placed between the mirrors.
Choose the correct option:

1. Assertion is true but reason is false.
2. Assertion is false but reason is true.
3. Both assertion and reason are true and reason is the correct explanation for assertion.
4. Both assertion and reason are true but reason is not the correct explanation for assertion.

Q.

How many times is a ray of light reflected by two plane mirrors placed parallel and facing each other?

Q.

Total internal reflection occurs when

1. Angle of incidence is equal to critical angle

2. Angle of incidence is greater than critical angle

3. Total internal reflection doesn't depend on angle of incidence or critical angle

4. Angle of incidence is less than critical angle

Q.

A person is standing at a distance of 2 m from a plane mirror. Now, he moves 1 m away from the mirror. His image will move:

1. 1 m towards the object

2. 2 m towards the mirror

3. 1m away from the object

4. 2 m away from the object

Q. When a plane mirror $AB$ is placed horizontally on level ground, with $B$ at a distance of $60m$ from the foot of a tower, the top of the tower and its image in the mirror subtends, an angle of ${90}^{\circ }$ at $B$. The height of the tower is

1. $30m$
2. $60m$
3. $120m$
4. $90m$

Q. The total number of images formed by two plane mirrors inclined at an angle of ${12}^{\circ }$ (object is placed symmetrically between them) is

1. 25
2. 27
3. 30
4. 29

Q.

When a plane mirror is placed horizontally on a level ground at a distance of 60m from the foot of a tower, the top of the tower and its image in the mirror subtend an angle of at the eye. The height of the tower will b

[CPMT 1984]

1. 60m

2. 90m

3. 30m

4. 120m

Q. A plane mirror is used to form an image of a real object. Identify the wrong statement.

1. The image is diminished.
2. The image is erect.
3. Image is at the same distance from mirror as that of object.
4. The image is virtual.

Q.

A : The image formed by a plane mirror is always virtual.

R : Image formed in a plane mirror is always equal in size.

1. Both A and R are correct and R is the correct explanation of A.

2. Both A and R are correct and R is not the correct explanation of A.

3. A is correct but R is incorrect.

4. A is incorrect but R is correct.

5. Both A and R are incorrect.

Q. What are the characteristics of image formed by a plane mirror?

Q. When a plane mirror is placed horizontally on a level ground at a distance of $60\text{m}$ from the foot of a tower, the top of the tower and its image in the mirror subtend an angle of ${90}^{\circ }$ at O. The height of the tower will be

1. $30\text{m}$
2. $60\text{m}$
3. $90\text{m}$
4. $120\text{m}$

Q. David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be:

1. 3 m
2. 5 m
3. 6 m
4. 8 m

Q. A man is running towards a plane mirror at a rate of $2$ m/s. With what speed does the image appear to approach the man

1. $1$ m/s
2. $4$ m/s
3. $2$ m/s
4. $3$ m/s

Q.

The figure shows a point object O in front of a plane mirror PQ. Complete the ray diagram and locate the image of O.

Q. Assertion : A virtual image can not be obtained on a screen.
Reason : Two plane mirrors placed parallel to each other, will form infinite virtual images for a real object placed between the mirrors.
Choose the correct option:

1. Both assertion and reason are true and reason is the correct explanation for assertion.
2. Both assertion and reason are true but reason is not the correct explanation for assertion.
3. Assertion is true but reason is false.
4. Assertion is false but reason is true.

Q. A cubical room is formed with $6$ plane mirror. An insect moves along diagonal of the floor with uniform speed. The velocity of its image in two adjacent walls are $20\sqrt{2}$ cm/s. Then the velocity of image formed by the roof is ;

1. $40$ cm/sec
2. $20$ cm/sec
3. 45 cm/sec
4. 9 cm/sec

Q.

State whether the following statement is true or false:

The image formed by a plane mirror is real.

1. True
2. False

Q. A man having a height $6m$, wants to see his full height in mirror. He observes an image of $2m$ height standing erect, then the type of mirror used is ?

1. Concave
2. Plane
3. Convex
4. None of these

Q. A plane mirror is used to form an image of a real object. Identify the wrong statement.

1. The image is diminished.
2. The image is erect.
3. Image is at the same distance from mirror as that of object.
4. The image is virtual.

Q. A Cassegrain telescope uses two mirrors as shown in above figure. Such a telescope is built with the mirrors $20mm$ apart. If the radius of curvature of the large mirror is $220mm$ and the small mirror is $140mm$, where will the final image of an object at infinity be?

Q. Choose the correct option regarding the image formed by a plane mirror

1. It is real
2. It is erect
3. It is inverted
4. None of the above

Q. An unnumbered wall clock shows time $04:25:37$, where 1st term represents hours, 2nd represents minutes and the last term represents seconds. What time will its image in a plane mirror show

1. $0.:35:23$
2. $08:35:23$
3. $07:35:23$
4. none of these

Q. A man standing in front of a plane mirror finds his image at a distance $6$ metres from himself. What is the distance of man from the mirror?

1. $9m$
2. $12m$
3. $3m$
4. $6m$

Q. What is the difference between the images formed by a large and a small mirror?

Q. If a boy moves with a speed $v$ towards a mirror, the image, to him, will appear to move with a speed:

1. $2v$ towards the mirror
2. $2v$ away from the mirror
3. $v$ towards the mirror
4. $v$ away from the mirror

Q. If any of the mirrors is removed, will he be able to see the objects?