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JEE PHYSICS MCQ: RAY OPTICS

1 Medium

1 of 1

Application +4 | -1

Image of an object approaching a convex mirror of radius of curvature

\mathrm{20}\,\,\mathrm{m}

along its optical axis is observed to move from

\frac{{25}}{3}\,\,\mathrm{m}

to

\frac{{50}}{7}\,\,\mathrm{m}

in

\mathrm{30 s}

. What is the speed of the object in

\mathrm{kmh}{\,^{ - 1}}

?

View answer and explanation

Correct option: A

3

Option A (

{\delta _3} > {\delta _2} > {\delta _1}

) is correct because the angle of deviation is directly proportional to the refractive index of the prism material.

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