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⭕ an object starts moving at an angle of 30° with the principal axis in the front of a biconvex lens of focal length +10cm if ∅ denotes angle at which images starts to move with principal axis then value of ∅ is ??

(Given u =-20cm)

Asked by jhajuhi19 | 27 Sep, 2020, 09:40: AM
Expert Answer
Focal length of the biconvex lens is = 10 cm 
It is given that the object is placed at 20 cm in left side of convex lens. 
This means that the object is placed at 2F position of the lens. 
When the object is placed at ths position we know that the image is formed to the right side of the lens is at 2F' position and real and inverted. 
from given information, an object starts moving at an angle of 30° with the principal axis in the front of a biconvex lens. 
Thus, the  angle at which images starts to move with principal axis then value of ∅ is 30°
 

Answered by Shiwani Sawant | 29 Sep, 2020, 10:58: PM
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