Reflection of Light Quiz

Luminous objects emit their own light, like the sun or a light bulb. Non-luminous objects do not emit light but reflect light from luminous objects, for example, a book or a table.

The angle of incidence is equal to the angle of reflection. This occurs due to the smooth surface reflecting light back in a predictable way.

Refraction is the bending of light as it passes from one medium to another. It occurs because the speed of light changes as it travels through different mediums, causing the light to change direction.

<ol> <li>The incident ray, refracted ray, and the normal at the point of incidence all lie in the same plane. 2. The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant for two given media, that is, <em>sin i / sin r</em> is constant.</li> </ol> Signup and view all the answers

<p>The refractive index <em>n</em> of a medium is the ratio of the speed of light in a vacuum to the speed of light in that medium. It is a measure of how much light slows down when it enters a medium. <em>n = c/v</em> where c = speed of light in a vacuum, and v = speed of light in the medium.</p> Signup and view all the answers

<p>The principle of reversibility of light rays states that a light ray will follow the same path when its direction is reversed, regardless of how many times it has been reflected or refracted. This means that light travels the same path whether it's going from point A to point B or from point B to point A.</p> Signup and view all the answers

<p>Using the formula <em>n = sin i / sin r</em>, we can calculate the refractive index. n = sin 30° / sin 20° = 1.53.</p> Signup and view all the answers

<p>Using the formula <em>n1 * sin i = n2 * sin r</em>, we can calculate the angle of refraction. (1.33 * sin 50°) = (1 * sin r). This solves to give an angle of refraction of r = 74.6°.</p> Signup and view all the answers

<p>Total internal reflection occurs when light travels from a denser medium to a less dense medium and the angle of incidence is greater than the critical angle.</p> Signup and view all the answers

<p>Optical fibers use total internal reflection to guide light signals along their core. The fibers are designed so that light entering the core strikes the inner surface at an angle greater than the critical angle, causing it to reflect repeatedly within the fiber, thus transmitting the signal.</p> Signup and view all the answers

<p>The critical angle is the specific angle of incidence in a denser medium for which the angle of refraction in the less dense medium is 90 degrees.</p> Signup and view all the answers

<p>Glass prisms offer greater durability and better image quality compared to mirrors. They also allow for total internal reflection, which is essential for redirecting the light path in binoculars.</p> Signup and view all the answers

<p>The pencil appears bent due to the refraction of light as it passes from water to air. The light rays from the submerged portion of the pencil bend away from the normal, causing the image of the pencil to appear at a different angle than the actual object.</p> Signup and view all the answers

<p>The focal length of a converging lens is the distance between the lens and the point where parallel rays of light converge after passing through the lens. A shorter focal length indicates a stronger converging power.</p> Signup and view all the answers

<p>A converging lens is thicker in the center and converges parallel rays of light to a point, while a diverging lens is thinner in the center and spreads parallel rays of light outward.</p> Signup and view all the answers

<p>The principal axis is a line that passes through the center of the lens and is perpendicular to its plane. The optical center is the point on the principal axis that is the midpoint between the lens surfaces.</p> Signup and view all the answers

<p>The distance of an object from a converging lens determines the characteristics of the image formed, including size, orientation, and whether it's real or virtual.</p> Signup and view all the answers

<p>Converging lenses correct long-sightedness by diverging the light rays before they enter the eye. Light rays from an object enter the eye of someone with long-sightedness and are focused beyond the retina instead of directly onto it, leading to blurry vision.</p> Signup and view all the answers

<p>A converging lens in a camera forms a real, inverted, and diminished image of the object on the camera's sensor or film. The focusing ring adjusts the distance between the lens and the sensor/film to ensure the formed image is sharply focused at the correct location.</p> Signup and view all the answers

<p>The principal axis is an imaginary, straight line passing through the center of the lens. The focal plane is a plane perpendicular to the principal axis, where all parallel rays of light passing through the lens converge.</p> Signup and view all the answers

<p>Ray 1: Passes through the optical center C without bending. Ray 2: Parallel to the principal axis and refracts to pass through the focal point F. Ray 3: Passes through the focal point F and emerges parallel to the principal axis. The intersection of these rays determines the location and size of the image.</p> Signup and view all the answers

<p>The principle of reversibility of light states that light can travel in both directions along the same path. This is applied to ray 3 in a converging lens, meaning that if a ray of light passes through the focal point F before the lens, it will emerge parallel to the principal axis.</p> Signup and view all the answers

<p>A real image can be projected onto a screen, while a virtual image cannot. Real images are formed by the actual convergence of light rays, whereas virtual images are formed by the apparent convergence of light rays.</p> Signup and view all the answers

<p>The size of the image formed by a converging lens is determined by the object's distance from the lens. If the object is placed closer to the lens than the focal point (F), the image will be magnified and virtual. If the object is placed farther away than the focal point, the image will be reduced and real.</p> Signup and view all the answers

The bouncing back of light when it hits a surface.

The angle between the incident ray and the normal at the point of incidence.

The angle between the reflected ray and the normal at the point of incidence.

The principle stating that the angle of incidence equals the angle of reflection (i = r).

The bending of light as it passes from one medium to another.

The ratio of the speed of light in a vacuum to the speed of light in a medium (n = c/v).

The ratio of sin i to sin r is constant for two media (sin i / sin r = constant).

Light will follow the same path when its direction is reversed after reflection or refraction.

The complete reflection of light in an optically denser medium when hitting a less dense medium.

The angle of incidence for which the angle of refraction is 90° in a less dense medium.

Fibers that carry light signals using total internal reflection.

A lens thicker in the center that focuses light rays to a point.

The distance from the lens to the point where light rays converge.

The line through the center of a lens perpendicular to its surface.

The midpoint on the principal axis of a lens.

The point on the principal axis where all parallel rays meet after passing through the lens.

The plane where all parallel rays meet after passing through the lens, perpendicular to the principal axis.

An incident ray that passes through the optical center C without bending.

An incident ray parallel to the principal axis refracted to pass through the focal point F.

An incident ray that passes through focal point F and emerges parallel to the principal axis.

An image that can be formed on a screen at the image plane.

An image that cannot be formed on a screen at its image plane.