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NEET UG PHYSICS MCQ: RAY OPTICS
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Understanding
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Red colour is used for danger signals because
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Correct option: B
It undergoes least scattering
Option B (It undergoes least scattering) is correct because red light has the longest wavelength and is scattered the least by atmospheric particles, making it visible from a greater distance.
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An object 5 cm tall is placed from a concave spherical mirror which has a radius of curvature of . The size of the image is
A ray of light is incident on the hypotenuse of a right-angled prism after travelling parallel to the base inside the prism. If is the refractive index of the material of the prism, the maximum value of the base angle for which light is totally reflected from the hypotenuse is
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 Assertion (A): In Snell's law , angle is always angle of incidence.
Reason (R): is applicable one medium in air (or vacuum).
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 Assertion (A): In Snell's law , angle is always angle of incidence.
Reason (R): is applicable one medium in air (or vacuum).