Question

1) state two practical use of convex lens and concave lens?

Answer 1

Practical use of convex lens and concave lens:-
1. Cameras: Objects placed at distances beyond 2 f would form clear images on the screen inside the cameras.

2. Movie Projectors: films placed between F and 2 f of the projector’s Focus would form real images on the screen (make sure the film is inserted-in inverted).

3. Magnifying Glass: objects placed within (f )are seen magnified.

4. Telescopes: the objectives of refracting telescopes are convex lenses. Most use a convex lens for the ocular (eyepiece) as well.

5. Microscopes: the objectives of microscopes are convex lenses. So are the oculars.

6. Dark Room Enlargers (nearly extinct now): similar to projectors.

7. Corrective Eyeglasses for Hyperopia (farsightedness) are convex lenses.

8. Binoculars, Opera Glasses and “Field Glasses” all use convex lenses.

9. Rifle Scopes: see telescopes.

10.Video Cameras, Fiber Optics Cameras for Internal Examinations, Spy Glasses, Web-Cams, use convex lenses.