Lenses and Light Rays Quiz

Questions and Answers

What is the primary function of a converging lens?

To spread light rays outward

To bend light rays so they meet at a focal point (correct)

To reflect light rays away from a surface

To absorb light without any refraction

Which of the following statements accurately describes a converging lens?

It is shaped to bend light rays outward.

It is primarily used to diffuse light across a wide area.

It focuses light rays at a single point called the focus. (correct)

It is thicker at the edges than in the middle.

What happens when light passes from a fast medium to a slow medium?

The light speed decreases, bending towards the normal. (correct)

The light is reflected back into the fast medium.

The light remains unaffected and travels straight.

The light speed increases, bending away from the normal.

What characterizes diverging or concave lenses?

They spread light rays outwards and diverge them. Signup and view all the answers

What phenomenon occurs when light exits a prism, resulting in a range of colors?

Dispersion Signup and view all the answers

What occurs to light rays when they enter a medium where their speed is different?

They are refracted and bent. Signup and view all the answers

Which of the following colors of light is not part of the visible spectrum produced by a prism?

Black Signup and view all the answers

Which feature differentiates convex lenses from concave lenses?

Convex lenses focus light while concave lenses scatter it. Signup and view all the answers

Study Notes

Lenses and Light Rays

Lenses can be classified into converging (convex) and diverging (concave) lenses.
Converging lenses bend light rays so they meet at a single point called the focus.
The curvature of a convex lens affects how it bends light; some are highly curved while others are flatter.
Thicker in the middle and thinner at the edges, convex lenses are primarily designed to converge light.
Diverging lenses, or concave lenses, are thinner in the middle and cause light rays to spread outwards.

Refraction

Refraction is the bending of light that occurs when it passes from one medium to another with different speeds.
Light rays bend towards the normal when moving from a fast medium to a slow medium.
The amount of bending is determined by the refractive indices of the two media involved.
Refraction is crucial for image formation by lenses and contributes to various optical phenomena.

Dispersion of Light

Light from the sun consists of seven colors: red, orange, yellow, green, blue, indigo, and violet.
When light passes through a glass prism, it disperses into its constituent colors, creating a spectrum.
This phenomenon, known as dispersion, occurs due to the varying refractive indices for different wavelengths of light.

Summary

Converging and diverging lenses serve different purposes by altering the path of light.
The principles of refraction and dispersion are fundamental in understanding optical properties and image formation.

Description

Test your knowledge on the classification and properties of lenses. This quiz covers converging and diverging lenses, their characteristics, and how they interact with light rays. Challenge yourself and learn more about optics!