Quiz About Light Concepts And Mirrors

Explanation
When an image is upright and virtual, it means that the image is formed on the same side as the object and it appears larger than the object. In this case, the magnification is positive, which indicates that the image is magnified or enlarged compared to the object. The positive sign signifies that the image is upright and virtual.

Explanation
The angle between the reflected ray and the normal is called the angle of reflection. This angle is formed when a ray of light is incident on a reflective surface and gets reflected. The angle of reflection is equal to the angle of incidence, which is the angle between the incident ray and the normal. It follows the law of reflection, stating that the incident ray, reflected ray, and the normal all lie in the same plane.

Explanation
The focal length of a lens is equal to half of its radius of curvature. Therefore, if the radius of curvature is 30cm, the focal length would be 15cm.

Explanation
After reflection, a ray parallel to the optic axis passes through the focal point. This is because the focal point is the point where parallel rays converge or appear to diverge from after passing through a lens or reflecting from a curved mirror. Therefore, when a ray parallel to the optic axis reflects, it follows the same principle and passes through the focal point.

Explanation
A highly polished material is called a mirror because a mirror is a reflective surface that has been carefully polished to create a smooth and shiny finish. When light falls on a mirror, it reflects back, allowing us to see our own reflection. The high level of polish on a mirror ensures that the surface is free from any imperfections or distortions, resulting in a clear and accurate reflection.

Explanation
A diverging mirror is also called a convex mirror because it is curved outward, causing light rays to diverge or spread out when they reflect off its surface. This type of mirror is commonly used in rear-view mirrors and security mirrors due to its ability to provide a wider field of view. The term "convex" refers to its shape, which bulges outward.

Explanation
The given correct answer for this question is "plane". A plane mirror is a type of mirror that produces an image that is equal in size and upright. It reflects light without any distortion or magnification, and the image appears to be located behind the mirror surface.

Explanation
Specular reflection occurs when the surface is smooth, shiny, and polished. A smooth surface allows light to bounce off it in a regular and predictable manner, resulting in a clear reflection. Shiny surfaces have a high reflectivity, which means they can reflect light effectively. Likewise, a polished surface is smooth and has a high level of reflectivity, making it capable of producing specular reflections. Therefore, all three options - smooth, shiny, and polish - are correct explanations for the occurrence of specular reflection.

Explanation
The focal length of a spherical lens or mirror is equal to half of its radius of curvature. In this case, the diameter of the metal ball is given as 24 cm, so its radius is 12 cm. Therefore, the focal length of the metal ball is 6 cm.

Explanation
Silver is the best reflecting metal because it has the highest reflectivity among all metals. This means that it can reflect a large amount of light that falls on its surface, making it appear very shiny and reflective. Silver is commonly used in mirrors, telescopes, and other optical devices because of its excellent reflective properties.

Explanation
When the question mentions a "reflecting spherical surface," it is referring to a concave mirror. A concave mirror is one that curves inward, causing light rays to converge. When an object is placed close to the vertex of a concave mirror, the image formed is virtual (meaning it cannot be projected onto a screen) and upright. This is because the light rays are reflected in such a way that they appear to be coming from a point behind the mirror, creating a magnified and upright image.

Explanation
A positive distance indicates that the image is formed on the same side of the lens as the object. In the case of a real image, the light rays converge to a point after passing through the lens, creating an actual image that can be projected onto a screen. Therefore, a positive distance would indicate the formation of a real image.

Explanation
In the reverse phenomenon in a plane mirror, the reflection appears to be flipped horizontally. This means that objects on the left side of the mirror appear to be on the right side in the reflection. Similarly, objects on the right side of the mirror appear to be on the left side in the reflection. Therefore, the correct answer is "right, right".

Explanation
When the magnification of an image is negative, it indicates that the image is inverted. This means that the image appears upside down compared to the object being observed.

Explanation
Total internal reflection occurs when light enters a less dense material at an angle greater than the critical angle. In this situation, instead of refracting or bending as it normally would, the light is completely reflected back into the denser material. This phenomenon is due to the change in speed of light as it moves from a more dense medium to a less dense medium.

Explanation
A plane mirror and a concave mirror can produce an image that is the same size as the object. The reflection in a plane mirror is a virtual image that appears to be the same size as the object. A concave mirror, when the object is placed within the focal point, can produce a real and magnified image that is the same size as the object. Therefore, both a plane mirror and a concave mirror can create an image that is the same size as the object.

Explanation
A convex mirror is a spherical mirror that has a reflecting surface on its outer bulging surface. It is called convex because it curves outward, causing light rays to diverge after reflection. This type of mirror is commonly used in applications where a wide field of view is required, such as in car side mirrors or security mirrors.

Explanation
The height of the virtual image formed by a plane mirror is equal to the height of the object in front of the mirror. This is because a plane mirror creates a reflection that is the same size as the object being reflected. In this case, since the height of the object is 5 cm, the height of the virtual image formed will also be 5 cm.

Explanation
Real images are formed by the actual intersection of light rays and can be captured on a screen or surface. These images are formed on the opposite side of the lens or mirror compared to the object. In the case of real images, the top of the object is at the bottom of the image, and the bottom of the object is at the top of the image. Therefore, real images are inverted or upside down with respect to the object.

Explanation
The given expression "M= height of the image/ height of the object" represents the magnification of an object. Magnification is defined as the ratio of the height of the image formed by an optical system to the height of the object being observed. In this case, "hi" represents the height of the image, and it is the correct answer for the expression.