Q2_Science

Why is the concave mirror also known as the Converging Mirror?

•  Because the parallel incident rays diverge at a focal point after reflection.

  
  

• Because the parallel incident rays diverge at a focal point before reflection.

  
  

•  Because the parallel incident rays converge at a focal point after reflection.

  
  

• Because the parallel incident rays converge at a focal point before reflection 

  
  

A spherical mirror is a mirror that has the shape of a piece cut out of a spherical surface. Which spherical mirror is considered a diverging mirror?

Where should an object be placed in front of a concave mirror so that the image will have the same size as the object?

• At the focus

• At the center of the curvature

• Between the focus and the vertex

• Between the focus and the vertex

Which glasses or lenses are used to correct the short-sighted eye defect?

• bipolar lens        

• concave lens      

• convex lens

• plane mirror

When the frequency of the wave increases, what happens to the wavelength?

• The wavelength increases

  
  

•  The wavelength decreases.
  

• The wavelength is not directly affected by the frequency of a wave.

• More specific information is needed to form a conclusion about the wavelength

Refer to the figure. What is the wavelength of infrared waves when compared to ultraviolet waves?

• faster

• longer

• slower

• shorter

What type of mirror do dentists use to examine teeth?

What type of mirror causes parallel rays of light to diverge and appear smaller than the objects being reflected?

• plane mirror

• convex

• concave

• lens

An electric motor converts electricity into mechanical energy, providing a power source for machinery. A generator does the opposite of this, converting mechanical energy into electricity. What two factors are required for generators and electric motors to work?

• Electricity and magnetism

• Electricity and thermal energy

• Magnetism and radiant energy

• Magnetism and thermal energy

The human eye is like a camera, and it contains a lens. What is the image formed by the eye lens?

• an inverted, virtual image of the object on the retina

• an inverted, real image of the object on the retina

• a straight or upright, real image of the object on the iris

• a straight or upright, real image of the object on the retina