P3 - Lenses & Light

Question 1

Describe how the image formed by the lens in a camera is different from the image formed by a lens used as a magnifying glass.

Answer 1

In a camera the image is real, inverted and diminished not virtual, upright or magnified.

Question 2

What name is given to the type of lens used as a magnifying glass?

Answer 2

Converging/convex

Question 3

Name a light detecting device which may be used in a camera.

Answer 3

Photographic film or CCD/CMOS

Question 4

Which part of the eye changes size to make sure the correct amount of light enters the eye?

Answer 4

Iris/pupil

Question 5

What is the function of the ciliary muscles inside the eye?

Answer 5

To change the size/curvature of the lens.

Question 6

What is the function of the lens inside the eye?

Answer 6

To focus the light onto the retina.

Question 7

The process by which the cornea and lens change the direction of the light is called what?

Answer 7

Refraction

Question 8

Give two similarities between an eye and a camera.

Answer 8

Both use a converging lens, both form an image that is real and inverted

Question 9

Which device passes light through optical fibres to produce images of the inside of the body?

Answer 9

Endoscope

Question 10

Give a medical use for a laser.

Answer 10

Eye surgery

Question 11

How does total internal reflection occur?

Answer 11

When the angle of incidence is greater than the critical angle.