Light and Mirrors

It is correct. Mirrors reflect light so we can see our images or other objects that are in front of the mirror.

It is correct. Periscopes reflect light in such a way that we can see around corners.

At focus F behind the mirror, highly diminished, point sized image is formed.

In convex mirrors or diverging mirrors, the reflecting surface is curved outwards.

For spherical mirrors of small aperture, R = 2f.

A lens, either a convex lens or a concave lens, has two spherical surfaces.

Convex lens are lenses that have a minimum of one surface that bends outwards and makes light to move inwards, causing the rays of light to come to a focus. A convex lens is bigger at its center in comparison to its edges and is applied in correcting long-sightedness. They are commonly used to examine small objects.

Image formed by the plane mirror is virtual, erect and of the same size as that of object, whereas the image formed by the convex mirror is virtual, erect and diminished.

Sunrays are focused at a point using concave reflectors. The solar radiations falling on the concave reflectors are focused at a point. Thus, large amount of heat radiations concentrated at a point increases the temperature of that point to a high value. Hence, option (1) is correct.

Concave mirror is used in a solar cooker because sun rays can be concentrated on one point, producing a huge amount of heat to cook the food.

Plane and convex mirrors will form erect and virtual images.

The line passing through the pole and the centre of curvature of a spherical mirror is called its principal axis.

The eyepiece of a telescope acts as a simple magnifier. It takes the real image formed by the objective lens and creates a virtual, magnified image that can be viewed comfortably by the eye. Virtual images cannot be projected on a screen but are perfect for viewing.

Car headlamps use concave mirrors to focus the light beam forward and illuminate the road ahead. The concave shape reflects light from the bulb into parallel rays, creating a directed beam. Parabolic concave mirrors also work but are essentially a type of concave mirror with specific curvature.