NEET UG PHYSICS MCQ: RAY OPTICS

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Analyzing +4 | -1

Statement I : The refractive index of diamond is

\sqrt{6}

and that of liquid is

\sqrt{3}

. If the light travels from diamond to the liquid, it will be totally reflected when the angle of incidence is

30^{\circ}

.

Statement II :

n=\frac{1}{\sin C}

, where

n

is the refractive index of diamond with respect to liquid.

View answer and explanation

Correct option: D

Statement I is false; Statement II is true

Statement I is false; Statement II is true. Statement I is incorrect because the angle of incidence for total internal reflection should be greater than the critical angle, which is 45 degrees in this case. Statement II correctly states the relationship between refractive index and critical angle.

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