NEET UG PHYSICS MCQ: RAY OPTICS

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Analyzing +4 | -1

Assertion (A) The relation among

{u}, {v}

and

{f}

for the spherical mirror is valid only for mirrors whose sizes are very small compared to their radii of curvature.

Reason (R) The laws of reflection are strictly valid for plane surfaces but not for large spherical surfaces.

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Correct option: A

If both Assertion and Reason are true and Reason is correct explanation of Assertion

Option A (If both Assertion and Reason are true and Reason is correct explanation of Assertion) is correct because the mirror formula is an approximation valid for paraxial rays, and the laws of reflection are strictly valid for plane surfaces.

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