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  • (a) Define power of a lens and write its unit. Name the type of lens whose power is negative. (b) A convex lens forms a real and inverted image of finite size at

(a) Define power of a lens and write its SI unit. Name the type of lens whose power is negative.

(b) A convex lens forms a real and inverted image of finite size at a distance of 50\; cm from it. Where is the object placed in front of the lens ? Give all possible positions of the object stating reason in each case.

(c) Draw labelled ray diagram for any one position of the object mentioned in (b) above.

 

 

 

 
 
 
 
 

Answers (1)

(a) Power of a lens is the Ability of a lens to diverge or converge light rays

and SI unit of Power – diopter (D

Type of lens whose power is negative is Concave lens

(b) Position of object:

(i) Beyond 2F1

(ii) At 2 F1

(iii) Between 2F1and F1

(c) Labelled ray diagram - 

Posted by

Safeer PP

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