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medium

wavelength

### Which is an example of refraction?

A fish appears closer to the surface of the water than it really is when observed from a riverbank.

### When light passes at an angle to the normal from one material into another material in which its speed is lower,

it is bent toward the normal to the surface.

### When light passes at an angle to the normal from one material into another material in which its speed is higher,

it is bent away from the normal to the surface.

### When a light ray moves from air into glass, which has a higher index of refraction, its path is

bent toward the normal.

### When a light ray passes from zircon (n= 1.923) into fluorite (n= 1.434) at an angle of 60°, its path is

bent away from the normal.

### When a light ray passes from water (n= 1.333) into diamond (n= 2.419) at an angle of 45°, its path is

bent toward the normal.

23°

18.0°

31.4°

real

### What type of image does a converging lens produce?

real of virtual

### In what direction does a parallel ray from an object proceed after passing through a diverging lens?

The ray is directed away from the focal point, F.

### In what direction does a parallel ray from an object proceed after passing through a converging lens?

The ray passes through the focal point, F.

### In what direction does a focal ray from an object proceed after passing through a diverging lens?

The ray exits the lens parallel to the principal axis.

### In what direction does a focal ray from an object proceed after passing through a converging lens?

The ray exits the lens parallel to the principal axis.

### All of the following images can be formed by a converging lens except which one?

real, upright, and magnified

two, one

### The focal length for a converging lens is

always negative.

### The focal length for a diverging lens is

always negative.

### A virtual image has a ___ image distance (q) and is located in ___ of the lens.

negative, front

5.71 cm

-34 cm

141

-1.25

### Which of the following describes what will happen to a light ray incident on a glass-to-air boundary at greater than the critical angle?

total internal reflection

### If atmospheric refraction did not occur, how would the apparent time of sunrise and sunset be changed?

Sunrise would be later, and sunset would be earlier.

mirages

Example: