Test Mode Reading Mode Right = 0 Wrong = 0
শূন্য
অসীম
ভূ -পৃষ্ঠের সমান
ভূ -পৃষ্ঠ থেকে কম
বক্রতার কেন্দ্রে
বক্রতার ব্যাসার্ধের উপর
ফোকাস তলে
অসীম
0°   
 90°  
45° 
180°
        40° 
-32°
-40° 
       12°
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: 3 months ago | Updated: 22 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
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
12 CV2 
12QV 
   Q22C  
Q2C2