Nothing. The focal length is defined as point where all of the light converges after passing through the lens ( for a convex mirror)and only depends on the mirror's curvature. So changing the incident light ray will cause no change in the focal length of the mirror.
When a convex lens and a concave lens are placed together, they can form a compound lens system known as a lens system. Depending on the relative orientations and distances between the two lenses, the resulting system can either magnify, diminish, or correct the incoming light rays. This configuration is commonly used in optical instruments such as microscopes and telescopes to manipulate the path of light rays.
If the concave mirror is missing in a projector, the light rays from the light source won't be properly focused onto the screen. This would result in a blurry and distorted image being projected, as the concave mirror is responsible for directing and converging the light rays to create a clear image.
Parallel light rays hitting a concave mirror will converge to a single focal point after reflection, due to the mirror's inward or converging shape. The focal point is located on the principal axis of the mirror, halfway between the mirror's center and the vertex. This property of concave mirrors is used in applications like focusing light in telescopes and for creating images in reflective devices.
If you cover half of a concave mirror, the reflected image will be dimmer, smaller, and less clear compared to when the mirror is fully uncovered. This is because the covered portion of the mirror is unable to reflect light, leading to a partial or distorted reflection.
A parallel beam of light coming from an infinite source when passed through a convex lens such that the refractive index of medium is less than the refractive index of lens the light will suffer deviation and the rays will converge at a point called focus of the lens on the opposite side where the rays have been coming. The image will be highly diminished as all the rays converge at a point.
When a convex lens and a concave lens are placed together, they can form a compound lens system known as a lens system. Depending on the relative orientations and distances between the two lenses, the resulting system can either magnify, diminish, or correct the incoming light rays. This configuration is commonly used in optical instruments such as microscopes and telescopes to manipulate the path of light rays.
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