Optics quiz 1-Physics

How fast does light travel

300,000,000 miles per second

Light travels in ___ lines

straight

What is the law of reflection?

The angle of incident is equal to the angle of reflection

What kind of mirrors does the law of reflection mainly apply to?

plane mirrors

The incident ray strikes the surface at an____

angle

The reflected ray bounces off the surface at the _________ angle

same

A plane mirror creates an image that appears to be ____ the mirror

behind

The type of image in which the figure appears to be behind the mirror is called a ______ image

virtual

The light does not actually pass through the mirror when creating a _____ image

virtual

If the distance from the object to the mirror is 4 feet, how long will the distance be from the mirror to the image

4 feet. The distance from and object to the mirror is equal to the distance from the mirror to the object

Spherical mirrors are ____

curved 

What is a concave mirror?

Zooms in and focuses at one point(focal point). used in shaving mirrors and telescopes

What is a convex mirror?

Bounces light everywhere for a wider field of view. Used in security and bus mirrors, also in rear view car mirrors.

What is a spherical mirror?

a mirror with a curved surface shaped like a part of a sphere 

What is a focal point

the point in which light rays converge after reflecting

What is the center of curvature?

the center of a sphere from which the mirror is cut

What is the focal length

the distance from the mirror to the focal point 

What is the radius of curvature

the distance from the mirror to the center of curvature

What is the formula for focal length

F=r/2

Concave mirrors- There are four key rules. What are they?

1. a ray parallel to the principal axis reflects through the focal point. 

2. A ray through the focal point reflects parallel to the principal axis

3. A ray perpendicular to the mirror reflects back on itself

4. A ray that hits the mirror at an angle to the principal axes reflects back at the same angle/

Convex mirrors- 2 rules

1. Ray parallel to the principal axes appears to reflect from the focal point

  

2. Ray toward the mirror vertex reflects symmetrically

Where do real images form in a concave mirror?

In front of the mirror

What is a real images?

A real images is a when light rays actually converge at a point. Usually formed by concave mirrors.

ON THE SAME SIDE AS THE ORIGINAL IMAGE

What is a virtual image?

When light rays appear to diverge from the focal point behind the mirror 

commonly seen in plane and convex mirrors

OPPOSITE SIDE OF THE ORIGINAL IMAGE

What is refraction?

When light bends as it passes from one medium(thing) to the next

Why does refraction occur?

The speed of light changes depending on the material

If light enters a denser medium(air to water), it will  _____

slow down. This means it will bend toward the normal

If light enters a lest dense medium, (water to air), it will ________

speed up, and bend away from the normal

Give an example of refraction

When you look down at your feet in the pool and they look to be shimmering