1. Light & Optics: Reflection

Question 1

To investigate how light rays reflect from a concave mirror

Answer 1

Question 2

Answer 2

Question 3

Speed of light?

Answer 3

300,000,000 m/s

3 x 10⁸ m/s

Three hundred million meters per second

Question 4

What is this type of reflection called?

Answer 4

Diffuse Reflection

Question 5

What is a virtual image?

Answer 5

a virtual image is for example a mirror, light reflecting from plane that will never create a clear image on a screen.

Question 6

what is a real image?

Answer 6

A real image is for example, we see a real image when we go to the cinema-this is a image that can be formed on a screen.

Question 7

what are the two types of images

Answer 7

There are two types of images: real and virtual.

Question 8

What is this kind of reflection called?

Answer 8

Regular Reflection

Question 9

The laws of reflection ?

Answer 9

🔹 The angle of incidence Equals the Angle of reflection.

🔹The incident ray, the normal and the reflected ray are all in same the plane.

https://www.youtube.com/watch?v=dwxaq4c9K6k

Question 10

Plane mirror

Answer 10

Question 11

Parallax

Answer 11

To show that the image distance behind the mirror as the object is in front of it.

Question 12

To show that thje object distance is equal to the image distance

Answer 12

Question 13

Investigate reflection from concave mirror.

Real image is created.

Answer 13

• Stand inside window on bright day with concave mirror pointing at your friend outside.
• Light will be reflected onto the wall inside the house.
• It will show a REAL IMAGE of your friend.

Question 14

To investigate how light reflect from a concave mirror

Answer 14

Question 15

Light rays reflecting through the focal point

Answer 15

Question 16

Light rays passing through the focal point

Answer 16

Question 17

A light ray incident at the pole

Answer 17

Question 18

Laws of reflection for concave mirrors

Answer 18

It is important to note that the laws of reflection are still being followed when light rays reflect from a concave mirror

Question 19

How images are formed in a concave mirror: Ray diagrams

Answer 19

Following just those few light rays we can see how images are formed in a concave mirrior, and why we sometimes get magnified images ands sometimes diminished images, and why sometimes the image is inverted and sometimes not. We can also see if the image is going to be real or imaginary.

Question 20

Relationship between the object and image distances and the focal length of a mirror

Answer 20

If you use a setup like this you should be able to move the screen and the mirror in such a way that a clear (real)image is seen on the screen.

Question 21

Virtual lengths

Answer 21

When you have studied physics, particularly the area of mechanics, you will see that when we use mathematical formulae to analyse real, physical, situations we frequently come across negative values.