Chapter 34 - Geometric Optics

Question 1

What is the object?

Answer 1

Source of light.

Question 2

What is the Imaging System?

Answer 2

Lens or Mirror.

Question 3

What is the Image?

Answer 3

The destination of light.

Question 4

What is a mirror?

Answer 4

A mirror is an object that reflects light.

Question 5

What is a Plane Mirror?

Answer 5

A flat mirror

EI. A Bathroom mirror

Question 6

If an object is placed at point P in front of a plane mirror, where will the image be formed?

Answer 6

At point P’ BEHIND the mirror.

Question 7

S=
S’=
Y=
Y’=

Answer 7

Distance from object to mirror
Distance from image to mirror
Height of object
Height of image

Question 8

If the image is behind the mirror,

S’ ** 0

Answer 8

<

Less than

Question 9

For a plane mirror:

S= * , Y’= **

Answer 9

• -S’

* *Y

Question 10

Where is an image formed?

Answer 10

At the point where the rays of light leaving a single point on an object either actually intersect or where they appear to originate from.

Question 11

When is the image a ‘Real Image’?

Answer 11

If the light rays actually do intersect.

Question 12

When is an image a ‘Virtual Image’?

Answer 12

If the light only appears to come from a certain point but isn’t physically there.

Question 13

Formulas for magnification:

3

Answer 13

1. Image height/object height
2. Y’/Y
3. -S’/S

Question 14

When is the image magnified?

Answer 14

M>1

Question 15

When is the image demagnified?

Answer 15

When M<1

Question 16

If m is positive, the image is ..

Answer 16

Upright

Question 17

If m is negative, the image is ..

Answer 17

Inverted

Question 18

Can you have a demagnified image that is upright?

Answer 18

Yes as long as 0

Question 19

What is a spherical mirror?

Answer 19

A mirror whose surface shape is spherical with radius of curvature R.

Reflecting surface is small

Question 20

Concave shape

Answer 20

)

Question 21

Convex shape

Answer 21

(