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Question
A ray of light is moving from a rarer medium to a denser medium and strikes a plane mirror placed at 90° to the direction of the ray as shown in the diagram.
(i) Copy the diagram and mark arrows to show the path of the ray of light after it is reflected from the mirror.
(ii) Name the principle you have used to mark the arrows to show the direction of the ray.
Diagram
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Solution
(i)
(ii) Principle of reversibility of light.
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Principle of Reversibility of the Path of Light
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Chapter 2: Light - Frequently Asked Questions in Board Examination [Page 153]
RELATED QUESTIONS
A ray of light from air suffers partial reflection and refraction at the boundary of water. In Fig. 4.16, which of the ray A, B, C, D and E is the correct
(i) refracted ray
(ii) partially reflected ray?
A ray of green light enters a liquid from air, as shown in Fig. The angle 1 is 45° and angle 2 is 30°.
- Find the refractive index of the liquid.
- Show in the diagram the path of the ray after it strikes the mirror and re-enters in air. Mark in the diagram the angles where ever necessary.
- Redraw the diagram if plane mirror becomes normal to the refracted ray inside the liquid. State the principal used.
