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(B) concave lens is a diverging lens,which causes light rays to spread out as they pass through it. When the screen is placed very far away,the light

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the light intensity on the screen continuously increases

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(B) concave lens is a diverging lens,which causes light rays to spread out as they pass through it. When the screen is placed very far away,the light rays are spread over a large area,resulting in low intensity. As the screen is moved closer to the lens,the area covered by the diverging beam of light on the screen decreases. Since the total power (or number of photons) of the light source remains constant,the intensity (power per unit area) increases as the area of the illuminated spot on the screen decreases. Therefore,the light intensity on the screen continuously increases as it is brought closer to the lens.

$A$ point source of light is placed on the principal axis between $F$ and $2F$ of a concave lens. On the other side,very far away,a screen is placed perpendicular to the principal axis. As the screen is brought closer towards the lens,

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