6.5 Optical Instruments

For microbiologist, they used microscope to ______.

• examine various of microorganisms.

• study celestial objects.

• examine eyes.

For astronomer, they used telescope to _____ .

• study and

  identify specimens of rocks and minerals

• identify

  and evaluate gemstones.

• study celestial objects.

For geologist, they used microscope to______ .

• examine eyes.

• study and

  identify specimens of rocks and minerals.

• study celestial objects.

The diagram shows the design of a simple astronomical telescope. The focal length of the lens P is f_p and the focal length of lens Q is f_Q.

What statement is correct?

• f_p shorter than f_Q

• The power of lens P is higher than lens Q.

• The image of lens P is real whereas the image of lens Q is virtual.

• The image magnification is the ratio of f_Q to f_p.

Which of the following ray diagrams is correct for magnifying glass?

• 
• 
• 
• 

For gemologist, they used magnifying glass to______

• examine eye.

• examine various microorganisms.

• identify and evaluate gemstones.