Test: Reflection Of Light - Class 9 MCQ

A concave mirror is used for shaving because it can create a magnified, upright image of the face when positioned correctly. This allows for a clearer view of fine details.

The normal is the perpendicular line drawn to the surface at the point where the incident ray strikes. Understanding the normal is essential for accurately measuring angles of incidence and reflection.

The size of the image remains the same when an object moves closer to a plane mirror, as the image formed is always the same size as the object.

A virtual image appears to diverge from a point behind the mirror and cannot be projected onto a screen. This characteristic is essential in distinguishing virtual images from real images.

Images formed by a plane mirror are virtual and erect, not inverted. This means they maintain the same orientation as the object.

A convex mirror always produces a diminished image that is virtual and erect. This property is useful in applications like rearview mirrors, providing a wider field of view.

Diffused reflection occurs on rough surfaces, causing light to scatter in many directions. This allows us to see objects from various angles, even if they are not perfectly aligned with our line of sight.

When two mirrors are parallel, an infinite number of images can form because the reflections continue indefinitely as each image acts as an object for the other mirror.

The angle of reflection is defined as being equal to the angle of incidence, as stated in the laws of reflection. This principle is fundamental in understanding how light behaves when it encounters reflective surfaces.

During lateral inversion, the left and right sides of an object are reversed in the mirror image. This is why text appears backwards when viewed in a mirror.

Lateral inversion occurs when light reflects off a plane mirror, resulting in a reversal of left and right in the image. This is why text appears backwards in a mirror.

When an object is placed at the focus of a concave mirror, the rays reflect out parallel to each other, forming a real and inverted image at infinity. This is a fundamental concept in optics.

A plane mirror forms a virtual image that is upright (or erect) and of the same size as the object. This is because the light rays appear to diverge from a point behind the mirror, which we perceive as the image.

The brightness of images formed between two parallel mirrors decreases due to light absorption at each reflection. This is why distant images are often less visible than nearer ones.

A real image is formed when light rays actually intersect at a point after reflection. This type of image can be projected onto a screen and is typically inverted.

A periscope is designed to allow a viewer to see over obstacles. It uses mirrors positioned at specific angles to reflect light, enabling vision from a hidden or lower position.

The focal length of a concave mirror is half its radius of curvature, expressed as \( f = \frac{R}{2} \). This relationship is fundamental in mirror equations and optics.

The equality of the angle of incidence and the angle of reflection is a fundamental principle that describes how light behaves upon striking a reflective surface, critical in optics.

The principal axis is the straight line that joins the pole of the mirror to the center of curvature and extends on both sides. It is crucial for ray diagrams in optics.

Spherical mirrors, particularly concave mirrors, are used in dental examinations to focus a parallel beam of light onto a small body part, allowing dentists to examine teeth and throats with clarity.