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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsReflection at curved surfaceEasy2 minPYQ_2020

PhysicsEasynumerical

The distance between the virtual image from its real object is $60 c m$ in case of a concave mirror and the image formed is $3$ times magnified. What is the magnitude of focal length (in $cm$ ) of the mirror?

Answer:

22.50

Solution:

$x + 3 x = 60 \Rightarrow x = 15 c m$

$u = - 15 c m$

$m = + 3$

$∴ m = \frac{f}{f - u} \Rightarrow + 3 = \frac{f}{f - (- 15)}$

$∴ 3 f + 45 = f \Rightarrow f = - 22.5 c m$

$|f| = 22.5 cm$

Subject:PhysicsTopic:Geometrical OpticsSubtopic:Reflection at curved surface

⏱ 2mℹ️ Source: PYQ_2020

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