Grade 8 Light Topics 1-3

Sami is 50 cm from a vertical mirror. He moves 20cm away. The distance between his image and himself is then ………….

• 100cm

• 120cm

• 140cm

• 40cm

The imaginary line perpendicular to the mirror is called the:

• Incident ray

• reflected ray

• normal line

The angle between the reflected ray and the normal line is called the:

• Angle of incidence

• Angle of reflection

• angle of convergent

• Angle of divergent.

If the angle of incidence is 45 degree, what is the angle of reflection?

• 90°

• 45°

• 180°

The Law of reflection states that - The angle of incidence is .................. the angle of reflection.

• equal to

• double

• half

The ray of light that strikes a mirror is called ________.

• an incident ray

• a reflected ray

• a normal ray

• none of the above

Light travels in ___________ lines

• wavy
• bent
• straight
• backwards

Which of the following is not a source of light?

• A. candle

• B. caver’s lamp

• C. mirror

• D. sun

What is reflection?

• Reflection is the bouncing of light off the surface that it strikes on.

• Reflection is the absorbing of light off the surface that it strikes on.

• Reflection is the bending of light off the surface that it strikes on.

• Reflection is the transmission of light off the surface that it strikes on.

Why can you see most objects? 

• they emit light
• light refracts through them
• light reflects off them
• They absorb light