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Geometrical Optics question

2023 · 30 Jan · Shift 1 · Q60

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Geometrical Optics
2023 · 30 Jan · Shift 1 · Q60

Geometrical Optics question

2023 · 30 Jan · Shift 1 · Q60

JEE MainPhysicsGeometrical OpticsNumerical+4 / −1

In an experiment for estimating the value of focal length of converging mirror, image of an object placed at

40 \mathrm{~cm}

from the pole of the mirror is formed at distance

120 \mathrm{~cm}

from the pole of the mirror. These distances are measured with a modified scale in which there are 20 small divisions in

1 \mathrm{~cm}

. The value of error in measurement of focal length of the mirror is

\frac{1}{\mathrm{~K}} \mathrm{~cm}

. The value of

\mathrm{K}

is

\underline{\hspace{2cm}}

.

Numerical answer

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