White Light & Colour

Question 1

When a beam of white light passes through a glass prism, the light is separated into a spectrum of colours. Which colour in the visible spectrum has the longest wavelength?

Accepted Answer

Red

Answer

Violet

Answer

Green

Answer

Blue

Question 2

When a beam of white light shines on a triangular glass prism, which statement correctly explains why a rainbow of colours appears on the other side of the prism?

Accepted Answer

Different colours in the white light are bent (refracted) by different amounts, separating the light into the seven spectrum colours.

Answer

The glass prism reflects the white light, and the reflected light looks like a rainbow.

Answer

The glass prism absorbs some colours and lets the remaining colours pass through, creating the rainbow.

Answer

All colours travel through the prism at the same speed, so they spread out into a rainbow.

Question 3

Why does a solid object placed in sunlight create a dark shape on the ground?

Accepted Answer

It blocks the straight‑line path of the light, preventing the light from reaching that area.

Answer

It bends (refracts) the light around it, leaving a dark region.

Answer

It reflects the light onto the ground, making the area appear dark.

Answer

It absorbs all the light that hits it, so no light reaches the ground.

Try three questions

When a beam of white light passes through a glass prism, the light is separated into a spectrum of colours. Which colour in the visible spectrum has the longest wavelength?

When a beam of white light shines on a triangular glass prism, which statement correctly explains why a rainbow of colours appears on the other side of the prism?

Why does a solid object placed in sunlight create a dark shape on the ground?

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