11. What is the point of convergence or the point from which rays appear to be produced in the lens?
12. With a Concave mirror, when an object is placed at the Focus (F) which of the following applies for the image?
13. The human eye forms the image of an object at its . . . . . . . .
14. Which one of the following statement is correct for a plane mirror?
15. Why does water tank appear shallower when viewed from the top?
16. Match the columns.
Column I
Column II
a. Refraction of light
1. Sky appears blue
b. Scattering of light
2. Twinkling of star
c. Reflection of light
3. Mirage
d. Total internal reflection
4. Kaleidoscope
| Column I | Column II |
| a. Refraction of light | 1. Sky appears blue |
| b. Scattering of light | 2. Twinkling of star |
| c. Reflection of light | 3. Mirage |
| d. Total internal reflection | 4. Kaleidoscope |
17. Who was the first person to obtain a spectrum by passing light through a prism?
18. The bending of light rays in a medium is called-
19. The final image in a simple microscope is
20. Which of the following is used to split white light into different colours?
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