Light Reflection and Luminous Objects

The video tutorial explains how we see objects due to light reflection. It distinguishes between luminous objects, which emit their own light, and non-luminous objects, which reflect light. The concept of light rays is introduced, showing how light travels in various directions. The tutorial then delves into the laws of reflection, explaining the angle of incidence and reflection, and how these angles are equal. It also covers the importance of the incident ray, reflected ray, and normal lying in the same plane. The video concludes with a promise of an experiment in the next lesson.

What is a luminous object?

• An object that refracts light

• An object that reflects light

• An object that emits its own light

• An object that absorbs light

Why can we see non-luminous objects?

• They absorb light

• They refract light

• They reflect light from luminous objects

• They emit their own light

In which directions do luminous objects emit light?

• In no direction

• In two directions

• In all possible directions

• In one direction

What is a ray of light?

• A curved path along which light travels

• A straight line path along which light travels

• A zigzag path along which light travels

• A circular path along which light travels

What is an incident ray?

• A ray that is absorbed by a surface

• A ray that strikes a surface

• A ray that passes through a surface

• A ray that is emitted by a luminous object

What is the angle of incidence?

• The angle made by the incident ray with the surface

• The angle made by the incident ray with the normal

• The angle made by the reflected ray with the surface

• The angle made by the reflected ray with the normal

According to the first law of reflection, what is always true?

• The angle of incidence is less than the angle of reflection

• The angle of incidence is greater than the angle of reflection

• The angle of incidence is unrelated to the angle of reflection

• The angle of incidence is equal to the angle of reflection

What does the second law of reflection state?

• The incident ray, reflected ray, and normal all lie in the same plane

• The incident ray and reflected ray are perpendicular

• The incident ray and normal are parallel

• The reflected ray and normal are parallel

What happens if the reflected ray does not lie in the same plane as the incident ray and normal?

• The ray will be refracted

• The ray will be absorbed

• The ray will continue in the same direction

• The ray will not be reflected in that direction

What is the normal in the context of reflection?

• A line parallel to the surface at the point of incidence

• A line that bisects the angle of reflection

• A line perpendicular to the surface at the point of incidence

• A line that bisects the angle of incidence