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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsReflection at curved surfaceEasy2 minQB

PhysicsEasyinteger

A concave mirror of focal length 10 cm forms an image which is double the size of object when the object is placed at two different positions. The distance between the two positions of the object is $____$ cm.

Answer:

Solution:

Real image, $m = - 2$ : $v = 2 u$ ; $1/ v + 1/ u = 1/ f \Rightarrow 3/2 u = 1/10 \Rightarrow u_{1} = 15 cm$ .

Virtual image, $m = + 2$ : $v = - 2 u$ ; $- 1/2 u + 1/ u = 1/10 \Rightarrow u_{2} = 5 cm$ .

Distance between positions $= u_{1} - u_{2} = 10 cm$ .

Stream:JEESubject:PhysicsTopic:Geometrical OpticsSubtopic:Reflection at curved surface

⏱ 2mℹ️ Source: QB

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