NEET UG PHYSICS MCQ: RAY OPTICS

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Application +4 | -1

A convergent lens of power 8D is used as a simple microscope. The magnification produced by the lens, when the final image is formed at least distance of distinct vision (i.e. 25 cm) is

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Correct option: D

Option D (3) is correct because the magnification produced by a simple microscope is given by

1 + (D/f)

, where D is the least distance of distinct vision and f is the focal length. The power is 8D, so f = 1/8 m = 12.5 cm. Thus, M = 1 + (25/12.5) = 3.

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