Quick Quiz 8K light

Which part of the eye converts light energy to electrical signals?

• the lens

• the optic nerve

• the pupil

• the retina

Which statement is true?

• Sound travels faster than light.

• Light does not travel. It is either on or off.

• Light travels faster than sound.

• Light and sound travel at the same speed.

Which of these statements is true?

• Light bounces evenly off rough surfaces.

• Light bounces evenly off smooth surfaces like mirrors.

• Light bounces off mirrors in all directions.

• Light does not bounce off mirrors.

Which of these statements is true?

• Light travels in straight lines.

• Light is stopped when it meets a solid object.

• Light does not travel in straight lines.

• Light will only travel for about 2000 km before it stops.

Your image in a mirror:

• is not as good looking as you really are.

• is upside down.

• is always bigger than you.

• seems to be behind the mirror.

How big will the angle of reflection be?

• 20°

• 30°

• 40°

• 60°

How are eyes and pinhole cameras similar?

• They both form an upside-down image.

• They both use a lens to focus light.

• They both convert light to electrical signals.

• They both take photographs.

Which phrase best completes the following sentence? We see things because:

• they are luminous.

• the Sun shines on them.

• light from them enters our eyes.

• light from our eyes shines on them.

Shadows are formed because:

• light will only travel a certain distance before it stops.

• a substance called ‘darkness’ collects behind some objects.

• some objects do not give out light in all directions.

• light cannot go through some objects.

A red filter:

• absorbs red light.

• lets through all colours of light.

• only lets red light through.

• changes all the colours into red light.