What Do You Know About Thin Converging Lens? Trivia Questions

1. A converging lens causes parallel light rays passing through it to __________ behind the lens.

Bend

Converge

Diverge

Spread out

A converging lens will cause the light rays passing through it to focus at a point,i.e, to converge at a point.

Explanation

A converging lens will cause the light rays passing through it to focus at a point,i.e, to converge at a point.

2. The principal focus is also known as the ____________.

The principal focus is also known as the focal point. The focal point refers to the point where parallel rays of light converge or appear to diverge from after passing through a lens or reflecting off a mirror. It is an important concept in optics and is used to determine the position and characteristics of images formed by lenses and mirrors.

Explanation

The principal focus is also known as the focal point. The focal point refers to the point where parallel rays of light converge or appear to diverge from after passing through a lens or reflecting off a mirror. It is an important concept in optics and is used to determine the position and characteristics of images formed by lenses and mirrors.

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3. When an object is placed a distance of less than f from a thin converging lens, an image is formed behind the object. What is a common device that makes use of this?

Camera

Magnifying glass

Photocopier

Spotlight

A magnifying glass is a common device that makes use of the phenomenon described in the question. When an object is placed closer to a converging lens than its focal length (f), the lens produces a virtual, magnified image of the object. This is exactly how a magnifying glass works - it uses a converging lens to create a magnified virtual image of an object, allowing us to see it more clearly and in greater detail.

Explanation

A magnifying glass is a common device that makes use of the phenomenon described in the question. When an object is placed closer to a converging lens than its focal length (f), the lens produces a virtual, magnified image of the object. This is exactly how a magnifying glass works - it uses a converging lens to create a magnified virtual image of an object, allowing us to see it more clearly and in greater detail.

4. When an object is placed exactly 2f away from a thin converging lens, the image formed is

Real, inverted, same size as object

Real, inverted, magnified

Virtual, upright, diminished

Virtual, upright, magnified

When an object is placed exactly 2f away from a thin converging lens, the image formed is real, inverted, and the same size as the object. This is because the object is placed at the focus point of the lens, causing the rays of light to converge and form an image on the other side of the lens. The image is real because it can be projected onto a screen, inverted because it is upside down compared to the object, and the same size as the object because the distance between the lens and the object is equal to the focal length.

Explanation

When an object is placed exactly 2f away from a thin converging lens, the image formed is real, inverted, and the same size as the object. This is because the object is placed at the focus point of the lens, causing the rays of light to converge and form an image on the other side of the lens. The image is real because it can be projected onto a screen, inverted because it is upside down compared to the object, and the same size as the object because the distance between the lens and the object is equal to the focal length.

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6. Name two types of lens you learnt in this lesson. Write your answer in the form: _______, _______

The two types of lens that were learnt in this lesson are converging and diverging.

Explanation

The two types of lens that were learnt in this lesson are converging and diverging.

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7. When light rays passes through the optical centre of a lens, they will

Be refracted

Be dispersed

Pass through at an angle

Pass through undeviated

Optical center is the point in the lens that all rays will pass through undeviated.

Explanation

Optical center is the point in the lens that all rays will pass through undeviated.