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NEET UG PHYSICS MCQ: RAY OPTICS

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Application +4 | -1

Orbital radius of moon is

3.8 \times 10^5 \mathrm{~km}

and its diameter is

3.5 \times 10^2 \mathrm{~km}

. It is seen from a telescope with lenses of

4 \mathrm{~m}

and

10 \mathrm{~m}

. Angle subtended by the moon's image on eye of observer will be

View answer and explanation

Correct option: B

20^{\circ}

The correct answer is B (

20^{\circ}

). The angle subtended by the moon's image is determined by the ratio of the focal lengths of the objective and eyepiece lenses.

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