Geometrical Optics – Online MCQs – Physics 10th

1. The size of the image is always smaller than the object in:

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

3. For a diverging lens the focal length is:

4. To view dim stars, we use:

5. 1 diopter = __________

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

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

8. The nature, position, and size of the image formed by a convex lens depend on the position of the object about point/s:

9. The power of a lens is measured in:

10. A magnifying glass forms an enlarged:

11. They are often used as rear-view mirrors or wing mirrors in vehicles, also called driver mirrors.

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

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

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

15. The short-sightedness can be corrected by using:

16. A ray of light bends away from the normal when it enters an optically

17. The entire light is reflected into the same denser medium, which is called total:

18. In a compound microscope, as compared to an objective, the eyepiece lens has a focal length:

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

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