# What Do You Know About Thin Converging Lens? Trivia Questions

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What Do You Know About Thin Converging Lens? Thin lenses can be diverging or converging. The converging lenses are thicker in the middle than near the edges and as two focal points, located on the optical axis, a distance 'f' from the center of the lens on either side of the lens. Take up this test and get to see how much you know.

• 1.

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

• A.

Bend

• B.

Converge

• C.

Diverge

• D.

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

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• 2.

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

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

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• 3.

### ____________ is the horizontal line which passes symmetrically through the optical centre.

Principal axis
principal axis
Explanation
This is the definition of principal axis.

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• 4.

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

focal point
Focal point
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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• 5.

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

• A.

Real, inverted, same size as object

• B.

Real, inverted, magnified

• C.

Virtual, upright, diminished

• D.

Virtual, upright, magnified

A. Real, inverted, same size as object
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.

### 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?

• A.

Camera

• B.

Magnifying glass

• C.

Photocopier

• D.

Spotlight

B. Magnifying glass
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.

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• 7.

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

• A.

Be refracted

• B.

Be dispersed

• C.

Pass through at an angle

• D.

Pass through undeviated

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

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• Current Version
• Nov 16, 2023
Quiz Edited by
ProProfs Editorial Team
• Mar 18, 2009
Quiz Created by
Andrielle.lee

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