Magnification

Q. The nature of the image formed by a concave lens is always:

1. Virtual and erect
2. Enlarged
3. Real and inverted
4. Diminished

Q.

How the inverted image is formed?

Q.

Does a concave lens make things bigger or smaller?

Q.

A spherical mirror, whose outer bulging surface is the reflecting surface is called concave mirror.

1. True
2. False

Q.

When an object of height 3 cm is placed at a distance of 30 cm from a lens, a real image is formed at a distance of 60 cm. Find out the height of the object.

1. +6 cm

2. +3 cm

3. -3 cm

4. -6 cm

Q.

What is the magnification of a plane mirror?

1. $1$

2. $0$

3. $-1$

4. $2$

Q.

If the numerical value of magnification is equal to 1, then

1. The height of the image is less than the height of the object

2. The height of the image is equal to the height of the object

3. The height of the image is more than the height of the object

4. No relationship can be established between the height of the object and image

Q. The nature of the virtual image of an object formed in a concave lens is:

1. Inverted and diminished
2. Upright and diminished
3. Inverted and enlarged
4. Upright and enlarged

Q.

Compare two quantities — Quantity A and Quantity B — and then determine which of the following statements describes the comparison:
In a lens, if
u - distance of the object from the lens
v - distance of the image from the lens
$h^i$ - height of the image
h - height of the object

1. Quantity B is greater.

2. The two quantities are equal.

3. Quantity A is greater

4. The relationship cannot be determined from the information given.

Q.

In a lens, if
$u$ - distance of the object from the lens
$v$ - distance of the image from the lens
$h_i$ - height of the image
$h$ - height of the object,

then determine the relationship between the two quantities, Quantity A and Quantity B.

1. Quantity A is greater
2. The two quantities are equal.
3. Quantity B is greater.
4. The relationship cannot be determined from the information given.

Q. A virtual, erect and diminished image is formed by a concave lens, when the object is :

1. beyond 2F
2. at 2F
3. all the above
4. between F and 2F

Q.

___ is the ratio of the height of the image to the height of the object.

1. Focus

2. Curvature

3. Magnification

4. Focal length

Q. Magnification produced by a spherical mirror is the ratio of the ______.

1. object distance to the image distance.
2. image distance to the object distance.
3. height of the image to the height of the object.
4. height of the object to the height of the image.

Q.

In the case of a convex lens, when the object is beyond $2F,$the image is formed

1. at infinity

2. between $F$and $2F$

3. beyond $2F$

4. at $F$

Q. A convex lens of focal length f will form a magnified real image of an object if the object is placed-

Q. The magnification produced by a plane mirror is $+1$. What does this mean?

Q. If M is the magnification of a mirror, match the following values to the orientation and height of image.

1. Erect image
2. Inverted image
3. Same size as object

Q. An very tall mirror is placed vertically with its centre at $(-2,3)$ facing the left and a point object is placed at $(-5,1)$. What are the coordinates of the image?

1. $(-1,3)$
2. $(1,1)$
3. $(7,3)$
4. A reflection is not formed

Q. Magnification produced by a spherical mirror is the ratio of the ______.

1. height of the object to the height of the image.
2. image distance to the object distance.
3. height of the image to the height of the object.
4. object distance to the image distance.

Q. Magnification produced by a spherical mirror is the ratio of the ______.

1. object distance to the image distance.
2. height of the image to the height of the object.
3. height of the object to the height of the image.
4. image distance to the object distance.

Q. To find the image distance for varying object distances in case of a convex lens of focal length 15cm, a student obtains on a screen a sharp image of a bright object by placing it at 20cm distance from the lens. After that he gradually moves the object away from the lens and each time focuses the image on the screen.
a) In which direction- towards or away from the lens does he move the screen to focus the object?
b) How does the size of the image change?

Q. to find the image distance for varying object distance in case of convex lens of focal length 15cm a student obtains on a screen a sharp image of a bright object by placing it at 20cm distance from the lens.after that he gradually moves the object away from the lens and each time focuses the image on the screen.
(a)in which direction towards or away from the lens does he move the screen to focus the object?
(b)how does the size of image change ?

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

Q.

A candle is placed at 60 cm from the pole of a concave mirror with focal length of 20 cm. Find the distance at which the image is formed and hence magnification.

Q.

What is the magnification of a plane mirror?

1. $2$

2. $-1$

3. $1$

4. $0$