NEET UG PHYSICS MCQ: RAY OPTICS

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Application +4 | -1

A convex lens and a concave lens, each having the same focal length of 10 cm, are put in contact to form a combination of lenses. The power of the combination is

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Correct option: C

Zero

Option C is correct because the power of a lens combination is the sum of the individual lens powers. Since the convex and concave lenses have the same focal length but opposite signs, their powers cancel each other out, resulting in a total power of zero.

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