Image Formation by Convex Lens

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 lens, object placed between focus and optical centre

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

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

Q. An object is placed at a distance of 12 cm from the optical centre of a convex lens of focal length 20 cm, as shown:


Answer the following questions based on the given details.

iv. What will be the characteristic of the image when the object is placed at a distance of 21 cm from the lens?

[1 mark]

1. Enlarged, real, and inverted
2. Enlarged, virtual, and erect
3. Diminished, real, and inverted
4. Same size, real, and inverted

Q.

A convex lens of very large focal length will make?

1. higher divergence of light rays

2. lesser divergence of light rays

3. lesser convergence of light rays

4. higher convergence of light rays

Q.

Identify the condition, which will form a real, inverted and equal sized image of the object.

1. concave lens, object placed between focus$F_1$ & pole O.

2. convex lens, object placed at $2F_1$

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

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

Q.

The centre of curvature of a convex lens is at $40cm$ and its central portion is wrapped in black paper as shown below. If an object is placed at $90cm$, find the nature of image formed.

1. The intensity of the image formed will increase.

2. The Image formed will be diminished.

3. The intensity of the image formed will decrease.

4. Image will not be formed.

Q.

For the object placed between the optical centre and focus of a convex lens, the image formed is:

1. real and enlarged

2. real and diminished

3. virtual and enlarged

4. virtual and diminished

Q.

If AB is an object and A'B' is an image formed, then match the following.

1. 1 - A, 2 - C, 3 - A, 4 - B

2. 1 - D, 2 - C, 3 - A, 4 - B

3. 1 - A, 2 - C, 3 - B, 4 - D

4. 1 - C, 2 - A, 3 - A, 4 - B

Q.

A Convex lens always forms a real image.

1. True

2. False

Q.

What is the nature of the lens and the position of the object if the image formed is of the same size as that of the object?

1. concave lens, at 2F₁

2. convex lens, at F₁

3. convex lens, at 2F₁

4. concave lens, at F₁

Q.

Identify the condition, which will form enlarged, virtual and erect image?

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

2. Concave lens, object placed beyond centre of curvature.

3. Convex lens, object placed between $F_1$ and optical centre O.

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