Question

1. What is the centre of sphere of which spherical mirror is a part called ?
2. Which type of mirror is used in torches as reflector?
3. Write one use of convex mirror.
4. A tank or pond or a bucket containing water appears to be shallower than its actual depth. Which phenomenon is responsible for this?
5. What is dispersion of light?
6. Which type of thermal expansion it is when there is change in original length of solid rod on heating?
7. Why a thick walled glass tumbler cracks when hot tea or milk is poured into it?.
8. What is the S.I. unit of coefficient of superficial expansion?
9. Write the formula for coefficient of volume expansion.
10. In which state of matter is thermal expansion maximum?

Section B
When a ray of light travels from rarer medium to denser medium.
1. What happens to its path?
2 Show this by diagram.
3. What is Snell's law.​

Answer 1

Answer:

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Explanation:

1. Pinkhhhjkkk

Answer 2

Explanation:

1.centre of curvature

2.concave mirror

3.The passenger side mirror in the car

4.Refraction of light

5.The splitting up of light into ist constituents colours while passing from one medium to other.

6.Thermal expansion of solids.

7.When hot tea or milk is poured into the glass its surface expands.However,due to low thermal expansion of outer surface is quite small.

8.Kelvin

9.k^-1

10. solids.

Section-B

1.It bends towards normal.

3. A relation between the path taken by a ray of light in crossing the boundary of separation between two contacting substances.

2