« previous next »

Author Question: It is desired to project an image of an object four times actual size with a lens of focal length 20 ... (Read 188 times)

fahad

  • Hero Member
  • *****
  • Posts: 570
on: Jul 29, 2018
It is desired to project an image of an object four times actual size with a lens of focal length 20 cm. What object distance should be used?
 
  A)
 
  100 cm
  B)
 
  80 cm
  C)
 
  4 cm
  D)
 
  25 cm
  E)
 
  5 cm

Question 2

Alpha rays can penetrate
 
  A)
 
  air only.
  B)
 
  a piece of paper.
  C)
 
  several millimeters of aluminum.
  D)
 
  several centimeters of lead.
  E)
 
  several meters of iron.


234sdffa

  • Sr. Member
  • ****
  • Posts: 341
Reply #1 on: Jul 29, 2018
Answer to Question 1

D

Answer to Question 2

B


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

fahad

  • Hero Member
  • *****
  • Posts: 570
Reply #2 on: Jul 29, 2018
TY


234sdffa

  • Sr. Member
  • ****
  • Posts: 341
Reply #3 on: Jul 29, 2018
You're welcome


« previous next »
 

Did you know?

Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

Did you know?

Less than one of every three adults with high LDL cholesterol has the condition under control. Only 48.1% with the condition are being treated for it.

Did you know?

The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

Did you know?

Illicit drug use costs the United States approximately $181 billion every year.

Did you know?

Aspirin may benefit 11 different cancers, including those of the colon, pancreas, lungs, prostate, breasts, and leukemia.

Relationship between winter rainfall and chuckwalla, Sauromalus, size Relationship between winter rainfall and chuckwalla, Sauromalus, size
Detritivores are often classified according to their body size as microflora, microfauna, mesofauna, Detritivores are often classified according to their body size as microflora, microfauna, mesofauna,
Cataract. When the pupil is dilated, an abnormal opacity or whiteness of the lens can be observed in Cataract. When the pupil is dilated, an abnormal opacity or whiteness of the lens can be observed in
Taken by Hinode's Solar Optical Telescope on January 12, 2007, this image of the Sun reveals th Taken by Hinode's Solar Optical Telescope on January 12, 2007, this image of the Sun reveals th
Gravitational Redshift The color of light from the same object located at diffe Gravitational Redshift The color of light from the same object located at diffe
Cai Guo-Qiang, Project to Extend the Great Wall of China by 10,000 Meters: Project for ... Cai Guo-Qiang, Project to Extend the Great Wall of China by 10,000 Meters: Project for ...
Video: Medullary osmotic gradient - influencing factors

For a complete list of videos, visit our video library