NEET UG PHYSICS MCQ: RAY OPTICS

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Understanding +4 | -1

When a biconvex lens of glass having refractive index

\mathrm{1}\mathrm{.47}

is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index

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Correct option: A

Equal to that of glass

Option A is correct because when a lens acts as a plane sheet of glass, it means there is no refraction, implying that the refractive index of the lens is equal to the refractive index of the surrounding medium.

More Questions from RAY OPTICS

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An object 5 cm tall is placed

\mathrm{1}\,\,\mathrm{m}

from a concave spherical mirror which has a radius of curvature of

\mathrm{20}\,\,\,\mathrm{cm}

. The size of the image is Red colour is used for danger signals because A ray of light is incident on the hypotenuse of a right-angled prism after travelling parallel to the base inside the prism. If

\mathrm{\mu }

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

2{f}

.

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