Geometrical Optics Chapter 2

Question 1

What are the laws of reflection?

Answer 1

1. The angle of incidence is equal to the angle of reflection. i=r
2. The incidence ray, The normal, and the reflected ray are all on the same plane.

Question 2

Explain Parallax

Answer 2

Parallax is the apparent relative movement of an object due to the movement of the observer.

Question 3

Explain Real image

Answer 3

A real image is formed by the actual intersection of light rays, always inverted an can be shown on a screen.

Question 4

Explain Virtual image

Answer 4

Formed by the apparent intersection of light rays, always erect and cannot be shown on a screen.

Question 5

What does a plane mirror do to an image

Answer 5

Makes it laterally inverted, same size image that as far away from the mirror as the actual object is.

Question 6

Explain light and give it’s speed in air

Answer 6

Light is a form of energy that travels away from the source producing it at a speed of about 3 x {10^8}m/s

Question 7

Explain self-luminous

Answer 7

Objects that give out their own light

Question 8

Explain non-luminous

Answer 8

Objects that do not give out their own light but light from other sources bounce off it into your eye to see them.

Question 9

How does light travel

Answer 9

Light travels in straight line ex: in path of light dust and moisture int he air show up.

Question 10

What is a straight line of light called

Answer 10

ray

Question 11

Explain diverging beams of light

Answer 11

out from a point (v)

Question 12

Explain converging beams of light

Answer 12

in towards a point (cone)

Question 13

What is reflection

Answer 13

Bouncing of light off an object

Question 14

Explain regular reflection

Answer 14

Bouncing of light off a smooth, silvered and polished surface called a mirror.

Question 15

Explain diffuse reflection

Answer 15

Bouncing of light from a rough surface that scatters in all different directions

Question 16

Describe where an image is formed in a plane mirror and what sort of image it is

Answer 16

A virtual image formed in a plane mirror is on the perpendicular from the object to the mirror (straight across) and the same distance behind the mirror as the object is in front. Image is always laterally inverted and the same size

Question 17

What does no parallax between two objects mean

Answer 17

The are in the same line and the same distance from the observer

Question 18

Give three uses of plane mirrors

Answer 18

overhead projector
to see oneself
periscope