iGCSE Light Waves

Complete the sentence: The angle of incidence is

• equal to the angle of reflection.

• greater than the angle of reflection.

• less than the angle of reflection.

• not comparable to the angle of reflection.

Tags

NGSS.MS-PS4-2

What happens when a ray of light goes from a less dense medium into a more dense medium?

• It bends towards the normal.

• It bends away from the normal.

• It passes straight through the medium with no change.

• It reflects back at the boundary.

Tags

NGSS.MS-PS4-2

Which of the following best describes the term refractive index?

• the number that represents the amount a substance bends light

• the number that represents the amount a light ray is reflected

• the angle through which light bends

• none of the above

Which of the following statements is a reason for using prisms over plane mirrors in a periscope?

• The picture will be in colour.

• The light is refracted rather than refracted.

• The image will be brighter and clearer.

• the image will be the same.

Tags

NGSS.MS-PS4-2

Which of the following objects uses mirrors and the law of reflection in order to work?

• a periscope

• an endoscope

• a kaleidoscope

• all of the above

Tags

NGSS.MS-PS4-2

Total internal reflection occurs under which conditions?

• when the angle of incidence is greater than the critical angle

• when the angle of incidence is smaller than the critical angle

• when the angle of reflection is greater than the critical angle

• when the angle of reflection is smaller than the critical angle

Tags

NGSS.MS-PS4-2

Complete the sentence: Refraction causes light to

• bounce off surfaces.

• pass through substances with no effect.

• change speed.

• bend around corners.

Tags

NGSS.MS-PS4-2

Which of the following is a property of waves?

• reflection

• refraction

• diffraction

• all of the above

Tags

NGSS.MS-PS4-2

What is the critical angle for glass when the refractive index is 1.45?

• 52⁰

• 42⁰

• 44⁰

• 34⁰

A ray of light in air enters a glass block. The angle of incidence in air is 30°. The angle of refraction is 20°. What is the refractive index of the glass?

• 1.00

• 0.68

• 1.46

• 0.17

Tags

NGSS.MS-PS4-2