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NEET UG PHYSICS MCQ: RAY OPTICS
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Medium
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Analyzing
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Assertion: The cloud in sky generally appear to be whitish.
Reason: Diffraction due to cloud is efficient in equal measure at all wavelengths.
Reason: Diffraction due to cloud is efficient in equal measure at all wavelengths.
View answer and explanation
Correct option: C
If assertion is true but reason is false.
Option C is correct. Clouds appear whitish because they scatter all wavelengths of light equally, but the reason given is incorrect; it's scattering, not diffraction, that causes this.
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Statement-A: The minimum distance between an object and its real image formed by a convex lens is .
Statement-B: The distance between an object and its real image is minimum when its magnification is -1. Assertion: We cannot produce a real image by plane or convex mirrors under any circumstances.
Reason: The focal length of a convex mirror is always taken negative. If both the object and image are at infinite distance from a refracting telescope its magnifying power will be equal to
Statement-B: The distance between an object and its real image is minimum when its magnification is -1. Assertion: We cannot produce a real image by plane or convex mirrors under any circumstances.
Reason: The focal length of a convex mirror is always taken negative. If both the object and image are at infinite distance from a refracting telescope its magnifying power will be equal to