A paper weight is hemispherical with radius 3 cm. It is kept on a printed page, the printed letter will appear at a height - cm from the center of the hemisphere when viewed vertically.

3 cm

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1 cm

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2 cm

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1.21 cm

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Solution

The correct option is C 3 cm
Data: $μ_{a} = 1, μ_{g} = 1.5.. (s a y), R = 3 c m, u = - 3 c m$

$\frac{μ_{g}}{v} - \frac{μ_{a}}{u} = \frac{μ_{g} - μ_{a}}{R}$

$\frac{1.5}{v} - \frac{1}{- 3} = \frac{1.5 - 1}{3}$

$\frac{1.5}{v} = - \frac{1}{3} + \frac{1}{6}$

$v = 3 c m$

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A paper weight is hemispherical with radius 3 cm. It is kept on a printed page, the printed letter will appear at a height - cm from the center of the hemisphere when viewed vertically.

The correct option is C 3 cmData: μa=1,μg=1.5..(say),R=3cm,u=−3cmμgv−μau=μg−μaR1.5v−1−3=1.5−131.5v=−13+16v=3cm

The correct option is C 3 cm
Data: $μ_{a} = 1, μ_{g} = 1.5.. (s a y), R = 3 c m, u = - 3 c m$

$\frac{μ_{g}}{v} - \frac{μ_{a}}{u} = \frac{μ_{g} - μ_{a}}{R}$

$\frac{1.5}{v} - \frac{1}{- 3} = \frac{1.5 - 1}{3}$

$\frac{1.5}{v} = - \frac{1}{3} + \frac{1}{6}$

$v = 3 c m$