(C) When the upper half of the lens is covered, the remaining lower half of the lens still forms the complete image of the object at the same position

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the intensity of the image decreases

(C) When the upper half of the lens is covered, the remaining lower half of the lens still forms the complete image of the object at the same position. This is because every point on the lens contributes to the formation of the image. However, since the total amount of light passing through the lens is reduced, the intensity of the image decreases.

Class 12 Physics Ray Optics and Optical Instruments Refraction by Lenses

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$A$ convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black, then

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A
the image shifts upward
B
the image shifts downward
C
the intensity of the image decreases
D
the intensity of the image increases

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Ray Optics and Optical Instruments

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Refraction by Lenses

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$A$ convex lens of crown glass $(n = 1.525)$ will behave as a divergent lens if immersed in:

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$A$ convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black, then

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$A$ convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will

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