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  • (a) Define the following terms : (i) Power of a lens (ii) Principal focus of a concave mirror (b) Write the relationship among the object distance ,

(a) Define the following terms :

(i) Power of a lens

(ii) Principal focus of a concave mirror

(b) Write the relationship among the object distance (u), image distance (\nu ) and the focal length (f) of a

(i) Spherical lens

(ii) Spherical mirror

(c) An object is placed at a distance of 10 cm from optical centre of a convex lens of focal length 15\; cm. Draw a labelled ray diagram to show the formation of image in this case.

 

 

 

 
 
 
 
 

Answers (1)

(a)

(i) Power of a lens is the Ability of a lens to converge or diverge light rays/reciprocal of focal length of lens.

(ii) Principal focus of a concave mirror is a point on principal axis at which light ray parallel to principal axis converges after reflection.

(b) For:

(i) Spherical lens,  1/ v − 1/ u = 1/ f

(ii) Spherical mirror, :1/ v + 1/ u = 1/ f

(c) Ray diagram to show the formation of image is- 

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Safeer PP

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