IGCSE Physics Quiz on Light and Reflection

What is the primary function of a periscope in submarines?

• To measure depth underwater
• To allow visibility above the water surface
• To communicate with other submarines
• To navigate underwater

In regular reflection, what type of surface is required to see clear images?

• Rough surfaces
• Smooth surfaces
• Translucent surfaces
• Opaque surfaces

When light passes from a rarer medium to a denser medium, what happens to its speed?

• It increases
• It decreases
• It remains the same
• It fluctuates

Which of the following statements about the angle of incidence and angle of refraction is true when light travels from a denser to a rarer medium?

• Angle of incidence is greater than angle of refraction
• Angle of incidence is equal to angle of refraction
• Angle of incidence is less than angle of refraction
• Angle of incidence does not affect angle of refraction

What does the refractive index of a medium indicate?

• The color of the medium
• The speed of light in the medium
• The density of the medium
• The ratio of the speed of light in air to the speed of light in the medium

If a pencil is placed in water, how does it appear to an observer?

• It appears straight
• It appears broken
• It appears longer
• It appears shorter

What happens to the frequency of light when it passes from one medium to another?

• It increases
• It decreases
• It remains the same
• It becomes unpredictable

In the context of refraction, what is the normal line?

• The line along which light travels
• The line perpendicular to the surface at the point of incidence
• The line that connects two mediums
• The line that indicates the angle of incidence

When light travels from air into glass, which of the following occurs?

• The light bends away from the normal
• The light bends towards the normal
• The light does not bend
• The light reflects back into the air

What is the effect of refraction on the appearance of an object submerged in water?

• It appears lower than its actual position
• It appears higher than its actual position
• It appears to change color
• It appears to disappear