Science_Light_HumanEye_Test

Science – Test ( light and reflection, Human Eye) M.M:50

A. One Marks Questions. (Marks 12 )

1. Where will the image be formed when an object is placed between the
pole and focus point of the mirror?
2. A convex lens has a focal length of 50cm.What is its power?
3. An object placed at F of a convex lens will produce an image at ______
4. Mirrors used in vehicle headlights is__________Mirror
5. Dispersion of light by a glass prism takes place because of ________
6. Negative value of focal length of a spherical mirror indicates that it is______mirror.
7. Light is a form of ___________ radiation
8. A ________ image can be obtained on a screen.
9. An object placed at F of a concave mirror will produce an _________ image
10. A person is not able to see distant objects clearly, because he is suffering from _________
11. An object placed at 2F of a convex lens will produce an image ______,______
12. Lens formula is expressed as._________


B. Two Marks Questions (Marks 8 )

13. What is the cause of cataract?
14. Hypermetropia is corrected by which type of lens?
15. Why do we prefer a convex mirror as a rear-view mirror in vehicles
16. Why does the sky appear dark instead of blue to an astronaut?

C. Three Marks Questions. (Marks 15 )
17. Define refraction and reflection of light.
18. What is presbyopia? How is it corrected?
19. What is the difference between real and virtual images?
20. Find the focal length of a convex mirror where radius of curvature is 32 cm.
21. What are the uses of a concave mirror?

C. Five Marks Questions. (Marks 15 )

22. An object is placed at a distance of 10cm from a convex mirror of focal
length 15 cm. Find the position and nature of the image.
23. What is refraction of light? Write a law of refraction.
24. An object 5 cm in length is held 25 cm away from a converging lens of focal length 10cm. Draw the ray diagram and find the position, size and nature of the image formed.