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A convex lens of focal length fis placed in front of a screen. A point...

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A convex lens of focal length fis placed in front of a screen. A point source of light is placed at some distance, (f< d < 4f) from the screen. A circular spot of light is formed on the screen. The lens is moved between source and screen starting from the position of source, thenAs lens is moved away from source towards screen, size of spot remains constantAs lens is moved away from source towards screen, size of spot decreases continuouslyAs lens is moved away from source towards screen, size of spot keep on increasingAs lens is moved away from source size of the spot first decreases then increases

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