Magnification of Mirrors

Q.

Derive mirror formula for a concave mirror when image formed is (i) real (ii) virtual. Also give the sign convention used.

Q. A concave mirror produces two times magnified real image of an object placed at 10 cm in front of it. Find the position of the image.

1. 10 cm in front of mirror
2. 20 cm behind the mirror
3. 10 cm behind the mirror
4. 20 cm in front of mirror

Q.

Question 9
Magnification produced by a rear view mirror fitted in vehicles

(a) is less than one
(b) is more than one
(c) is equal to one
(d) can be more than or less than one depending upon the position of the object in front of it .

Q. An object is placed at 60 cm from the pole of a concave mirror whose focal length is 20 cm.
(i) Find the image distance.​

1. 60 cm
2. 15 cm
3. 30 cm
4. 20 cm

Q.

What kind of image will you get if an object is placed between ${}^{\prime }{C}^{\prime }$ and ${}^{\prime }{f}^{\prime }$ for a concave mirror?

1. Real, inverted and diminished

2. Virtual, erect and magnified

3. Virtual, inverted and magnified

4. Real, inverted and magnified

Q. If an object placed at the centre of curvature of a concave mirror moves towards the focus, then the magnitude of magnification .

Q. Magnification produced by a rear view mirror fitted in vehicles:

1. is equal to one
2. is more than one
3. can be more than or less than one depending upon the position of the object in front of it
4. is less than one

Q. If an object is placed in front of a curved mirror at a distance is 7 cm, the image distance is 13 cm. Image is formed on the same side of the mirror as the object. Find magnification.

1. 2.3
2. 1.85
3. -3.8
4. -1.85

Q. Choose the option which depicts the image formation for the figure given below.

1. A highly enlarged image is formed at infinity.
2. An image of the same size is formed at the infinity.
3. An image with positive magnification is formed at the centre of curvature.
4. An image with negative magnification is formed at the centre of curvature.

Q. A plane mirror is placed along the x-axis facing negative y-axis. The mirror is fixed. A point object is moving with $3\hat{i}+4\hat{j}$ in front of the plane mirror. The relative velocity of image with respect to its object is

1. $-8\hat{j}$
2. $8\hat{j}$
3. $3\hat{i}-4\hat{j}$
4. $-6\hat{i}$

Q. A concave mirror forms an inverted image of an object placed at a distance of 12 cm from it. The size of the image is double that of the object. Where is the image formed?

Q.

What is magnification in the below diagram?

Given OA = $10cm$ and O’A’ = $2cm$.

1. $5$
2. $-2$
3. $-0.2$
4. $-10$

Q. How will the magnitude of magnification of a concave mirror changes, if an object placed at the centre of curvature is moved towards the Focus of the mirror?

1. Decreases
2. Increases
3. Remains constant
4. Becomes infinity

Q. Once I suddenly woke up in bed and, by mistake, saw the image of my clock in a plane mirror and panicked that I was late. The time it showed was 8:45. (The clock did not have numbers on it). The correct time was -

1. 2:45
2. 3:15
3. 3:45
4. 4:15

Q. A telescope made of mirrors is used to observe the moon. It forms the inverted image of the moon at 3.5 km from the eye piece. Find the diameter of the image of the moon. Given the diameter of the moon is 1700 km and the distance of the moon from the earth is 350, 000 km.

1. $h^{{}^{\prime }}=3.5m$
2. $h^{{}^{\prime }}=1700m$
3. $h^{{}^{\prime }}=350,000m$
4. $h^{{}^{\prime }}=17m$

Q.

Find out the image position formed by concave mirror, considering the image formed by mirror as an object for concave mirror.

1. 30 $cm$, from the pole.

2. 40 $cm$, from the pole.

3. 60 $cm$, from the pole.

4. 20 $cm$, from the pole.

Q. The image of an object placed at a distance of 25 cm on the principal axis of a concave mirror from its pole, is formed on the object itself. Find out the linear magnification.

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

Q.

Relate the image distance ($v$), object distance ($u$) , image height ($h^{{}^{\prime }}$) and object height ($h$) to the formula of magnification $\left(M\right)$ for a mirror.

1. $M=\frac{h^{\prime }}{h}$ = $\frac{-u}{v}$

2. $M=\frac{h^{\prime }}{h}$ = $\frac{-v}{u}$

3. $M=\frac{h}{h^{\prime }}$ = $\frac{v}{u}$

4. $M=\frac{h^{\prime }}{h}$ = $\frac{u}{v}$

Q. The magnification produced by a plane mirror is ___.

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

Q. The magnification produced by a plane mirror is ___.

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