What is a ray?

Academic Mathematics NCERT Class 6

RAY

A ray is a line that has a fixed point or vertex as one of its ends and it moves infinitely in other direction denoted by an arrowhead.

A line has no finite ends; it extends infinitely in both directions; denoted by two arrowheads at its ends. A line segment has two fixed points as its two ends.

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Updated on: 10-Oct-2022

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What is the angle of incidence of a ray if the reflected ray is at an angle of $90^{\circ}$ to the incident ray?
Is the incident ray will be parallel to the emergent ray in a glass prism?
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 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?
Explain a clear diagram of the incident ray and reflected ray.
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 is going towards the focus of a concave lens. draw a ray diagram to show the path of this ray of light after refraction through the lens.
A ray of light is incident on a plane mirror at an angle of 30°. What is the angle of reflection?
A vertical ray of light strikes the horizontal surface of some water:(a) What is the angle of incidence?(b) What is the angle of refraction?
(a) What is myopia (near-sightedness)?(b) Draw a ray-diagram to show an eye having myopia. (c) Draw another ray-diagram to show how myopia can be corrected by using a lens.
What is the principle of reversibility of light? Show that the incident ray of light is parallel to the emergent ray of light when light falls obliquely on a side of a rectangular glass slab.

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