Topic 13 - Lights & Lens

Which type of image is produced by a converging lens on a screen?

• inverted and real

• inverted and virtual

• upright and real

• upright and virtual

Which statement about the image formed by a converging lens is correct?

• It is always real and erect.

• It is always real and inverted

• It is always virtual and erect

• It may be either virtual or real

A person stands 2.0 m in front of a plane mirror as shown. How far from the person is her image?

• 2.0 m

• 3.0 m

• 3.5 m

• 4.0 m

What happens to light as it passes from glass into air?

• Its frequency decreases because its speed decreases

• Its frequency increases because its speed increases

• Its wavelength decreases because its speed decreases.

• Its wavelength increases because its speed increases

What is true for real images formed by a converging lens?

• They are inverted

• They are on the same side of the lens as the object

• They can never be shown on a screen

• They cannot be seen by the human eye

Which diagram shows rays of light passing through a converging lens?

• 
• 
• 
• 

The diagram shows a ray of light striking a plane mirror.

What must the angle of incidence be if the total angle between the incident and reflected rays is 80°?

• 40°

• 50°

• 80°

• 100°

What is the refractive index of a medium?

• the ratio of the speed of light in air to the speed of light in the medium

• the ratio of the speed of light in the medium to the speed of light in air

• the ratio of the speed of light in the medium to the speed of light in vacuum

• the ratio of the speed of light in vacuum to the speed of light in the medium

A student uses a converging lens to produce an enlarged virtual image of a scale she wishes to read accurately. The focal length of the lens is 10 cm. What is a suitable distance between the scale and the lens?

• 8 cm

• 10 cm

• 15 cm

• 20 cm

The diagram shows a right-angled prism being used to turn a ray of light through 90°. What is the critical angle for the light in the glass?

• less than 45°

• equal to 45°

• greater than 45°

• equal to 90°