A concave mirror is used to form an image of | vedclass

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(B) When a concave mirror forms an image of a distant object like the Sun,every part of the mirror contributes to the formation of the complete image.

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to make the image less bright than before

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(B) When a concave mirror forms an image of a distant object like the Sun,every part of the mirror contributes to the formation of the complete image. If the lower half of the mirror is covered,the light rays from the Sun that would have reflected off that portion are blocked. However,the remaining upper half of the mirror still receives light from all parts of the Sun and focuses it to form the complete image. Since the total amount of light reaching the screen is reduced,the intensity (brightness) of the image decreases,but the image remains complete.

$A$ concave mirror is used to form an image of the Sun on a white screen. If the lower half of the mirror were covered with an opaque card,the effect on the image on the screen would be

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