Under what condition in an arrangement of two plane mirrors, incident ray and reflected ray will always be parallel to each other, whatever may be angle of incidence. Show the same with the help of diagram.

Academic Physics NCERT Class 10

When two plane mirrors are placed at a right angle $(90^{\circ})$ to each other, then the incident and reflected rays will be parallel to each other.

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Updated on: 10-Oct-2022

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Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.
Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray of light parallel to the principal axis of a convex mirror and show the angle of incidence and angle of reflection on it.
What is the angle of incidence of a ray if the reflected ray is at an angle of $90^{\circ}$ to the incident ray?
Draw a labelled ray diagram to show the path of the reflected ray corresponding to an incident ray of light parallel to the principal axis of a convex mirror. Mark the angle of incidence and angle of reflection on it.
The angle between an incident ray and the plane mirror is 30°. The total angle between the incident ray and reflected ray will be:(a) 30° (b) 60° (c) 90° (d) 120°
Explain a clear diagram of the incident ray and reflected ray.
A ray of light is incident normally on a plane mirror. What will be the:(a) angle of incidence?(b) angle of reflection?
Is the incident ray will be parallel to the emergent ray in a glass prism?
In an experiment to trace the path of a ray of light through a glass prism for different values of angle of incidence a student would find that the emergent ray:(a) is parallel to the incident ray.(b) perpendicular to the incident ray.(c) is parallel to the refracted ray.(d) bends at an angle to the direction of the incident ray.
A ray of light strikes a plane mirror such that its angle of incidence is 30°. What angle does the reflected ray make with the mirror surface?
State and explain the laws of reflection of light at a plane surface (like a plane mirror), With the help of a labelled ray-diagram. Mark the angles of 'incidence' and 'reflection' clearly on the diagram. If the angle of reflection is 47.5°, what will be the angle of incidence?
What is meant by the 'angle of incidence' and the 'angle of refraction' for a ray of light? Draw a labelled ray diagram to show the angle of incidence and the angle of refraction for a refracted ray of light.
A student traces the path of a ray of light through a triangular glass prism for different values of angle of incidence. On analyzing the ray diagrams, which one of the following conclusions is he likely to draw?(A) The emergent ray is parallel to the incident ray.(B) The emergent ray bends at an angle to the direction of the incident ray.(C) The emergent ray and the refracted ray are at right angles to each other.(D) The emergent ray is perpendicular to the incident ray.
(a) With the help of a diagram, show how when light falls obliquely on the side of a rectangular glass slab, the emergent ray is parallel to the incident ray.(b) Show the lateral displacement of the ray on the diagram.(c) State two factors on which the lateral displacement of the emergent ray depends.
Is diffuse and regular reflection follow the first law of reflection that is (the incident ray, the normal at the point of the incident, and the reflected ray all lie in the same plane)?

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