Geometrical Optics – Online MCQs – Physics 10th

1. Which statement is correct?

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

3. The convex lens becomes a magnifying glass when:

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

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

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

7. When the angle of refraction is 90° and the refractive index for water is 1.33, the critical angle is:

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

9. The long-sightedness can be corrected by using:

10. The ability to distinguish between two closely placed objects or point sources is called an instrument:

11. For a diverging lens the focal length is:

12. The defect in which the image is formed beyond the retina is called:

13. A ray of light incident at an angle to the normal bends towards the normal when it enters into an optically:

14. In a compound microscope, the focal length of the objective lens is:

15. A magnifying glass forms an enlarged:

16. The human eye acts like a:

17. When the angle of incidence becomes larger than the critical angle, then

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

19. In this eye defect, the image of a distant object is formed in front of the retina and not at the retina itself.

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