Science 8 Light and Optics Unit Exam

Which of the following concepts is associated with Sir Isaac Newton?

• Sight occurred when light beams from the eyes struck an object.

• Sight occurs when light bounces off an object to the eye.

• Light travels in straight lines, and the law of reflection.

• White light is a mixture of colors.

The best explanation for shadows is

• black light is projected onto an object

• light bends only part way round solid objects

• when light hits an opaque object, it cannot go any further

• when light strikes an object, the object projects a black light

Lin’s theatre group wants to create a dark and gloomy forest scene. They cut out a silhouette of trees from thick, black paper and hold it in front of a stage light to create a shadowy effect. The problem is the shadow cast on the backdrop is too small. What could they do to increase the size of the shadow?

• Move the light away from the paper cutout.

• Move the paper cutout closer to the curtain.

• Move the paper cutout closer to the light.

• Trim the paper cutout to a smaller size.

Which of the following has the greatest amount of energy

• Red Light
• UV 
• Microwave
• X-Ray

A red bird appears red because it REFLECTS what color

• Magenta
• Red
• Cyan
• Doesn't reflect any light

High energy light consist of ________ wavelength and _______ frequency

• Short, Low

• Long, Low

• Short, High

• Long, High

Which form of light travels the fastest?

• Radio
• Infrared
• Gamma
• All travel the same speed

This is an example of...

• Reflection
• Refraction
• Polarization
• Spectrum

Tags

NGSS.MS-PS4-2

_____ is a lens that is thicker in the middle.

• Convex
• Concave

_____ is a lens that is thinner in the middle..

• Convex
• Concave