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Q.

Light rays from a point object after refraction converges at a single point in case of _____________.

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a

Convex lens

b

Concave lens

c

Plane mirror

d

Biconcave lens

answer is A.

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Detailed Solution

  • A ray of light which is originally parallel to the principal axis passes through the focus after refraction through the lens. 
  • A ray of light passing through the optical centre of the convex lens doesn't bend after refraction but goes straight. 
  • Also, a ray of light going along the path of the principal axis of the convex lens also goes straight and doesn't deviate. 
  • When a ray of light passes through the focus of a convex lens then it becomes parallel to the principal axis after refraction through the lens.

 

 


 

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