(a) An object is placed 10 cm from a lens of focal length 5 cm. Draw the ray diagrams to show the formation of image if the lens is (i) converging, and (ii) diverging.
(b) State one practical use each of convex mirror, concave mirror, convex lens and concave lens.
Answers
Explanation:
a) The object is placed in front of the lens, i.e., the object distance = 10cm
Focal length, f= 5cm
So, the image formed using the lens:
(i) Converging lens or Convex lens:-
The image formed is at 2f of the other side which is real, inverted in nature and is the same size as the object.
(ii) Diverging lens or Concave lens:-
The image formed in between the optical center and focus, on the same side as the object. The image is virtual and erect in nature and has a diminished size as compared to the object.
(b) Practical use for:
(i) Convex Mirror: It is used as a rear-view mirror in vehicles to check back.
(ii) Concave Mirror: It is used by the dentists to get a larger view of the teeth during the treatment.
(iii) Convex Lens: It is used as a camera lens.
(iv) Concave Lens: It is used in eyeglasses and contacts.
You can get all the answers of Chapter 5 in the link below:
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