Convex Lens

Q.

Arrange the following steps to determine the focal length of a convex lens in proper order.
(A) Focus the lens to a distant object.
(B) Measure the distance between the lens and the screen.
(C) Place the lens on a stand.
(D) Adjust the position of the screen to obtain a clear image on it.

1. CABD

2. CBAD

3. CADB

4. CBDA

Q.

You are provided with the printed piece of paper using this paper, how will you differentiate between a convex and concave lens?

Q.

Convex lens is also known as a ___________.

1. diverging lens

2. bulging lens

3. converging lens

4. dispersing lens

Q. Two different types of lenses are placed on a sheet of newspaper. How will you identify their type without touching them?

Q. Two different types of lenses are placed on a sheet of newspaper. How will you identify their type without touching them?

Q.

A lens having two spherical surfaces bulging outward is called ______________.

1. convex lens

2. plano-concave lens

3. concave lens

4. plano-convex lens

Q. Paheli performs experiments with a mirror and finds that the image formed is always a diminished virtual image, What kind of mirror does she have?

1. Concave mirror
2. Plane mirror
3. Convex mirror
4. None of the above

Q. If an object is placed at centre of curvature of a convex lens, the image height is $5cm$. What will be the height of the image if the same object is placed between centre of curvature and focus of the convex lens?

1. Less than $5cm$
2. Equal to $5cm$
3. Greater than $5cm$
4. Infinitely large

Q.

Minimum number of rays required to find the position of an image in a convex lens is

1. 1

2. 2

3. 3

4. 4

Q. Where would the image form, if the object is placed at a finite distance from a concave lens?

1. At F
2. Between C and F
3. At O
4. Between F and O

Q. Primary focus of the convex lens lies on the right side of the optical centre of the lens.

1. True
2. False

Q.

Himanshu has two lenses A and B. When he touches both the lenses he finds that A is thicker at the centre than at the edges and B is thinner at the centre as compared to its edges. He has to focus sunlight on a particular point. Which one of them can he use?

1. He should use lens B

2. He should use lens A

3. Neither of the lenses can be used

4. Both the lenses can be used