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পদার্থবিদ্যা

2 MHz
5 MHz
4 MHz
20 MHz
 4.04 ×10-2Nm-2 
  2.20 Nm-2
      4.04 ×105 Nm-2
     2.02×105 Nm-2
Created: 4 months ago | Updated: 18 hours ago
Electromagnetic waves
Positrons
Protons
Electrons
behind the principal focus
a distance larger than 2 f on the same side as the object
a distance between f and 2 f behind
a distance beyond 2 f behind
Both length and cross sectional area are double
Both length and radius are soubled
Only the length is increased
Cross sectional areas reduced
12000J
16000J
18000J
33000J
Concave lens of focal length 50 cm
Concave lens of focal length 25 cm
Convex lens of focal length 50 cm
Convex lens of focal length 25 cm