Image Formation by Convex Lens

Q. Question 3
Where should an object be placed in front of a convex lens to get a real image of the size of the object?

(a) At the principal focus of the lens
(b) At twice the focal length
(c) At infinity
(d) Between the optical centre of the lens and its principal focus

Q.

A convex lens can form

1. real image only

2. virtual image only

3. both real and virtual image

4. erect image only

Q.

The image of an object in front of a lens is larger than the object. This implies that the lens is ___.

1. plane

2. concave

3. convex

4. can't be determined

Q.

A lens forms an enlarged, upright image of an object. What lens did you use? Also, is the image real or virual?

1. Concave lens. Real image.

2. Concave lens. Virtual image.

3. Convex lens. Virtual image.

4. Convex lens. Real image.

Q.

When is the image formed by convex lens virtual and erect?

1. When the object is placed between the focus $F_1$ and optical centre O.

2. When the object is placed at the focus $F_1$.

3. When the object is placed between the focus $F_1$ and $2F_1$

4. When the object is placed at the focus $2F_1$.

Q.

In the given figure, where do the diverging rays seem to meet?
($F_1$ , $F_2$ are the primary focus of the lens)

1. $2F_2$

2. $F_1$

3. $F_2$

4. $2F_1$

Q.

If there is a convex lens which is made of a material whose optical density is less than that of air, then

1. it remains a converging lens

2. it becomes a diverging lens

3. it doesn't refract light

4. it reflects the light

Q. An object placed between focus and optical center of a concave lens will produce an image

1. opposite side of object
2. Enlarge
3. Real and Inverted
4. Virtual and Erect

Q. State whether true or false:

1. True
2. False

Q.

Imagine if there is a convex lens which is made of a material whose optical density is less than that of the air, it would still be a converging lens.

1. True

2. False

Q. When object is placed in between convex lens and its focal point, image formed is

1. Same size, real and inverted
2. Same size, real and upright
3. magnified, virtual and upright
4. Diminishes, real and inverted

Q.

Find the angle between the emergent ray and incident ray when the light goes from air to glass slab. Given ${\mu }_{glass}$ ​= $1.5$

1. ${180}^{\circ }$
2. $0^{\circ }$
3. ${60}^{\circ }$
4. ${30}^{\circ }$

Q. In a glass slab, if the angle of incidence and emergence of light is i and e, then:

1. i + e = 90
2. i = 2e
3. i - e = 0
4. i = 0.5e

Q.

Identify the condition in which image formed is real, inverted and diminished from the following.

1. Concave lens, object placed between focus and optical centre

2. Concave mirror, object placed between centre of curvature and focus

3. Convex lens, object placed beyond 2$F_1$

4. Convex lens, object placed between $F_1$ and 2$F_1$

Q. When an object approaches a convex lens from infinity to focus, then image formed by it shifts

1. away from the lens
2. towards the lens
3. first away and then towards the lens
4. none of these

Q.

If $F_1$ and $F_2$ represents the foci of the lens, then at which point will the light rays meet?

1. $F_2$

2. $2F_2$

3. $2F_1$

4. $F_1$

Q.

Identify the condition in which image formed is real, inverted and diminished from the following.

1. Convex lens, object placed beyond 2$F_1$

2. Concave mirror, object placed between centre of curvature and focus

3. Concave lens, object placed between focus and optical centre

4. Convex lens, object placed between $F_1$ and 2$F_1$

Q.

If $F_1$ and $F_2$ represents the foci of the lens, then at which point will the light rays meet?

1. $2F_2$

2. $F_2$

3. $F_1$

4. $2F_1$

Q.

In the given figure, where do the diverging rays seem to meet?
($F_1$ , $F_2$ are the primary focus of the lens)

1. $2F_1$

2. $2F_2$

3. $F_2$

4. $F_1$

Q.

Find the angle between the emergent ray and incident ray when the light goes from air to glass slab. Given ${\mu }_{glass}$ ​= $1.5$

1. $0^{\circ }$
2. ${180}^{\circ }$
3. ${30}^{\circ }$
4. ${60}^{\circ }$

Q. Assertion :For the sensitivity of a camera, its aperture should be reduced. Reason: Smaller the aperture image focussing is also sharp.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q.

Identify the condition in which image formed is real, inverted and diminished from the following.

1. Convex lens, object placed beyond 2$F_1$

2. Convex lens, object placed between $F_1$ and 2$F_1$

3. Concave mirror, object placed between centre of curvature and focus

4. Concave lens, object placed between focus and optical centre

Q. In a glass slab, if the angle of incidence and emergence of light is i and e, then:

1. i + e = 90
2. i - e = 0
3. i = 2e
4. i = 0.5e

Q. In a glass slab, if the angle of incidence and emergence of light is i and e, then:

1. i + e = 90
2. i = 2e
3. i - e = 0
4. i = 0.5e

Q. How will you differentiate between the convex lens and concave lens i) A distant object ?

Q. An object is placed between F and O of a convex lens. The image formed is :

1. real, inverted and magnified
2. virtual, inverted and magnified
3. virtual, erect and magnified
4. virtual, erect and diminished

Q. In a glass slab, if the angle of incidence and emergence of light is i and e, then:

1. i - e = 0
2. i = 0.5e
3. i = 2e
4. i + e = 90