Question

principal focus is a real point for concave mirror but a virtual point for convex mirror. Give reason why? please give correct answers ​

Answer 1

Concave mirror

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Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror.

Convex mirror

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A convex mirror, or simply put a curved mirror, is a mirror in which the reflective surface bulges toward the light source. The surface of a curved mirror can be convex, which means bulging outward, or concave, bulging inward. A convex mirror reflects the light outwards and is therefore not used to focus light.

Convex mirrors, or curved mirrors, always form a virtual image because the focus and centre of curvature are imaginary points inside the mirror and cannot be reached. This means that images formed by a convex mirror cannot be projected onto a screen. Also the image is smaller than the object projected, but gets larger as this object approaches the convex mirror.

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