Science lesson-6.1

What is Reflection of light?

• Reflection of light is the process where light bounces off a surface at the same angle it hits it.
• Reflection of light is the absorption of light by a surface
• Reflection of light is the bending of light as it passes through a medium
• Reflection of light is the emission of light from a source

Which one is the example of best reflectors?

• Polished wood surfaces
• Black surfaces
• Polished metals like silver and aluminum, white surfaces like white paper or white paint
• Rough surfaces

What is a mirror image?

• The refraction of an object in a mirror

• The reflection of an object in a mirror.

What is periscope?

• Periscope is a type of submarine.
• Periscope is a type of telescope.
• Periscope is a type of microscope.
• Periscope is an optical instrument that allows an observer to see over, around, or through an obstacle.

Which statement regarding the ray diagram of reflection of light is correct.

• The ray diagram where the angle of reflection is greater than the angle of incidence
• The ray diagram where the incident ray is perpendicular to the normal line
• The ray diagram where the incident ray, normal line, and reflected ray all meet at the point of reflection is correct.
• The ray diagram where the reflected ray is parallel to the incident ray

Which instrument is used in submarine to see things on the surface of water when the submarine is submerged.

• Telescope
• Periscope
• Radar
• Sonar

What is normal in a ray diagram?

• Normal is a line parallel to the surface
• Normal is a line tangent to the surface
• Normal is an imaginary line perpendicular(90 degree) to the surface at the point of incidence.

• Normal is a line connecting two points on the surface

Things are visible to us because____

• The darkness that surrounds objects
• The heat emitted by objects
• The sound waves produced by objects
• The light that is reflected off an object

In periscope, the two mirrors are at an angle of______

• 45 degrees
• 90 degrees
• 60 degrees
• 30 degrees

Which one of the following is not an example of a good reflector.

• Mirror
• Metal

• Wood

• Water