Geometrical Optics – Online MCQs – Physics 10th

1. The human eye uses a convex lens system to form a:

2. When a light ray enters from a denser medium to a rare medium, it bends:

3. To illuminate the inaccessible places in the tooth, dentists use:

4. An optical fiber comprises:

5. A spherical mirror whose inner curved surface is reflecting is called:

6. The quantity which does not change during refraction is:

7. The S.I unit of power of a lens is:

8. The convex lens becomes a magnifying glass when:

9. In a telescope, as compared to an eye piece, the objective lens has a focal length:

10. The reciprocal of a lens focal length is called:

11. A magnifying glass forms an enlarged:

12. In a concave mirror, the image size depends upon:

13. One of the angles of a right-angled prism is

14. The ratio of the sine angle of incidence to the sine angle of refraction gives us a constant called the:

15. Lenses form images through:

16. The angle of incidence that causes the refracted ray to bend through 90° is called

17. The focus lies behind the mirror in:

18. Magnification = ?

19. In the photograph enlarger, the object is placed:

20. Refraction of light is caused by a change in speed, at the interface of two different mediums: