P14 Light

Question 1

What is a Conves Lens?

Answer 1

A convex lens make parallel rays converge (focus) towards the centre of the lens.

Question 2

What is a Concave Lens?

Answer 2

A concave lens makes parallel rays diverge away (spread out) from the centre of the lens.

Question 3

How do you find magnification?

Answer 3

Image height/Object Height

Question 4

What is the method for Ray Diagram?

Answer 4

Ray 1- A ray passing through the optical centre, 0, of the lens from the object.
Ray 2- A ray parallel to the principal axis, which refracts through the lens, passing through the principal focus.
Ray 3- A ray passing through the principal focus (on the same side as the object) and being refracted through the lens, emerging parallel to the principal axis.

Question 5

What is Ray 1 in the Ray Diagram?

Answer 5

Ray 1- A ray passing through the optical centre, 0, of the lens from the object.

Question 6

What is Ray 2 in the Ray Diagram?

Answer 6

Ray 2- A ray parallel to the principal axis, which refracts through the lens, passing through the principal focus.

Question 7

What is Ray 3 in the Ray Diagram?

Answer 7

Ray 3- A ray passing through the principal focus (on the same side as the object) and being refracted through the lens, emerging parallel to the principal axis.

Question 8

What is the Law of Reflection?

Answer 8

The reflected waves move away from the barrier at an equal angle to the incident waves.

Question 9

What is the Law of Refraction?

Answer 9

Refraction of waves is the change of direction of the waves when they travel across a boundary, from one medium to another.

Question 10

How do Lens work?

Answer 10

A Lens forms an image by refracting light.