NEET UG PHYSICS MCQ: RAY OPTICS

1 Medium

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Application +4 | -1

The focal lengths of objective and eye piece of a compound microscope are 2 cm and 8 cm. Find the distance of the object from objective so that the final image is seen at a distance of 20 cm from eyepiece.

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Correct option: B

2.32 cm

Option B (2.32 cm) is correct because it is calculated using the lens formula twice, first for the eyepiece and then for the objective, considering the final image distance and the focal lengths.

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