If the lower half of a concave mirror’s reflecting surface is made opaque, which of the following statements describe the image of an object placed infront of the mirror ${\rm{S1}}$: Intensity of the image will increase ${\rm{S2}}$: The image will show only half of the object ${\rm{S3}}$: No change in the image ${\rm{S4}}$: Intensity of the image will be reduced to half

NEET UG PHYSICS MCQ: RAY OPTICS

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Understanding +4 | -1

If the lower half of a concave mirror’s reflecting surface is made opaque, which of the following statements describe the image of an object placed infront of the mirror

\mathrm{S1}

: Intensity of the image will increase

\mathrm{S2}

: The image will show only half of the object

\mathrm{S3}

: No change in the image

\mathrm{S4}

: Intensity of the image will be reduced to half

View answer and explanation

Correct option: D

\mathrm{S4}

only

Option D (S4 only) is correct because making the lower half opaque reduces the amount of light contributing to the image, thus reducing its intensity.

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