Answer
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Hint:Ray diagrams assist us in tracing the path of light for a person viewing a point on an image of an item. The incident and reflected rays are represented by lines with arrows in a ray diagram. It also aids us in determining the direction of the light.
Complete step by step answer:
When light rays from infinity strike a concave mirror, convex mirror, concave lens, or convex lens, a drastically decreased picture is generated at the focus, as illustrated in the figure.
The mirror equation and lens equation can be used to confirm this.
Mirror Equation is given by: $\dfrac{1}{v} + \dfrac{1}{u} = \dfrac{1}{f}$
Lens Equation is given by: $\dfrac{1}{v} - \dfrac{1}{u} = \dfrac{1}{f}$
Substituting \[u = - \,\infty \] , \[v = f\]
Magnification \[m = \dfrac{v}{u} = \dfrac{f}{\infty } = 0\]
Hence, the image is point size.
So, the correct option is D.
Note: The focal length of all optical lenses is the distance from the lens to the focus point along the optical axis of the lens. The focal length of a lens is determined by three factors: the radius of curvature of the lens, the refractive index of the substrate from which the lens is constructed, and the medium in which the lens sits. Lenses with a highly curved shape and a high refractive index that are placed in a medium with a big difference in refractive index will have a shorter focal length and thus be more powerful. A lens' focal length can be estimated using the lens manufacturer's formula.
Complete step by step answer:
When light rays from infinity strike a concave mirror, convex mirror, concave lens, or convex lens, a drastically decreased picture is generated at the focus, as illustrated in the figure.
The mirror equation and lens equation can be used to confirm this.
Mirror Equation is given by: $\dfrac{1}{v} + \dfrac{1}{u} = \dfrac{1}{f}$
Lens Equation is given by: $\dfrac{1}{v} - \dfrac{1}{u} = \dfrac{1}{f}$
Substituting \[u = - \,\infty \] , \[v = f\]
Magnification \[m = \dfrac{v}{u} = \dfrac{f}{\infty } = 0\]
Hence, the image is point size.
So, the correct option is D.
Note: The focal length of all optical lenses is the distance from the lens to the focus point along the optical axis of the lens. The focal length of a lens is determined by three factors: the radius of curvature of the lens, the refractive index of the substrate from which the lens is constructed, and the medium in which the lens sits. Lenses with a highly curved shape and a high refractive index that are placed in a medium with a big difference in refractive index will have a shorter focal length and thus be more powerful. A lens' focal length can be estimated using the lens manufacturer's formula.
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