Terms/Concepts
What is refraction and why does it occur?
Refraction is the bending of light; caused by the change of speeds in different media.
Using salt, describe the image formed by a concave mirror if the object is at F.
NO IMAGE IS FORMED
If the angle between the incident ray and the plane mirror is 50 degrees, calculate the angle of reflection.
40 degrees.
What is the speed of light in a vacuum?
3 x 108 m/s
What does the law of reflection state (2 things)?
1. The incident ray, reflected ray, and normal line all lie on the same plane.
2. The angle of incidence is equal to the angle of reflection.
Using salt, describe the image formed by a convex mirror.
S= larger, A= upright, L= between mirror and F, T= virtual.
The index of refraction in acetone is 1.36. What is the speed of light in acetone?
2.21 x 108 m/s
Which type of light can humans see?
Visible light
What is the critical angle?
The angle of incidence that offers an angle of refraction of 90 degrees.
Using salt, describe the image formed by a concave mirror if the object is between C and F.
S= larger, A= inverted, L= between C and F, T= real.
Light travels from air into an optical fiber with an index of refraction of 1.44. If the angle of incidence on the end of the fiber is 22°, what is the angle of refraction inside the fiber?
Angle of refraction = 15 degrees
Provide 1 example for 1. a luminous object and 2. non-luminous object.
Answers will vary...
Luminous: sun, candle, fire, firefly, etc.,
Non-luminous: Earth, moon, tree, book, etc.,
What does it mean when magnification is negative?
The image is inverted.
Locate the image of an object that is between F and 2F for a converging lens. Is the image smaller, larger, or same size as the object?
Image is beyond 2F'. Image is larger than object.
An object 25 cm away from a lens produces a focused image on a film 15 cm away. What is the focal length of the converging lens?
focal length = 9.4 cm
Which type of light emits light/energy immediately after it receives energy?
Fluorescent
Why do diamonds sparkle?
Total internal reflection
Locate the image of an object beyond 2F on a diverging lens. Is the image smaller, larger, or same size as the object?
Between F and mirror. Image is smaller.
An object of height 3.0 cm is placed 8.0 cm from a converging lens of focal length 6.0 cm. Find (a) the location and (b) the height of the image.
a) di = 24 cm
b) hi = -9.0 cm
What type of reflection occurs when light hits a smooth surface?
Specular reflection