SP3h Lenses

Question 1

What is the power of the lens?

Answer 1

how much it bends light that is transmitted through it.

Question 2

What is the power of a lens determined by?

Answer 2

it’s focal length - the shorter/fatter the focal length, the stronger the power of the lens and vice versa.

Question 3

Power (D) = ?

Answer 3

1/focal length (m)

Question 4

Near point?

Answer 4

the closest an object can be from the eye without it appearing blurred.

Question 5

Far point?

Answer 5

the furthest an object can be from the eye without it appearing blurred.

Question 6

What do converging (convex) lenses do?

Answer 6

bend rays together.

Question 7

What do diverging (concave) lenses do?

Answer 7

spread rays out.

Question 8

What do converging and divergong lenses both do?

Answer 8

change the direction of the light transmitted through them.

Question 9

In a diverging lens, the rays of light do not actually go through the image only appear that way, so the image is ?

Answer 9

virtual.

Question 10

In a converging lens, the rays actually pass through the image, so the image is ?

Answer 10

real.

Question 11

Lens?

Answer 11

a piece of transparent material shaped to refract light in a particular way.