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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsReflection at curved surfaceMedium2 minQB

PhysicsMediummultiple choice

It was found that parallel rays after reflection from a curved mirror all the rays meet at the same point (distance f from the pole). Choose the correct statement(s) :-

Options:(select one or more)

Answer:

A, B, C

Solution:

Equal optical path (Fermat's principle): $2 f = (f - S (x)) + x^{2} + (f - S (x))^{2}$ - (B)

$f + S (x) = x^{2} + (f - S (x))^{2}$

$x^{2} = (f + S)^{2} - (f - S)^{2} = 4 f S (x)$

$S (x) = \frac{x ^{2}}{4 f}$ - a parabola, so the reflector is a paraboloid - (A), (C)

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

⏱ 2mℹ️ Source: QB

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