Question

choose the correct option
1:- When light moves from one optical medium to another, its
a:- frequency changes
b:- Speed changes
c:- Amplitude changes
d:- temperature changes
2:- When light rays moves from a rarer medium to a denser medium , then :
a:- <i> <r
b:- <i = <r
c:- <i < <r
d:- All of these
3:- The image formed by a concave mirror is virtual only when the object is :-
a:- Between C and F
b:- At F
c:- Beyond C
d:- Between F and P
4:- The image formed by a convex mirror is:-
a:- Erect and enlarged
b:- Erect and diminshed
c :- Inverted and diminished
d:- Inverted and enlarged
5:- A convex mirror is used as a
a:- Doctors head mirror
b:- Shaving mirror
c:- Telescope
d:- Reflector in street lamps.

B:- State true or false. Correct the false statements.
1:- A ray of light incident normally on a glass slab does not suffer refraction.
2:- A rainbow is formed in the sky because of reflection.
3:- The speed of light increases if the density of the medium increases.
4:- A swimming pool appears shallower than it actually is because of refraction from a rarer to a denser medium.
5:- The refractive index depends upon the speed of light.
6:- A concave mirror is used as a shaving mirror.
7:- Convex mirrors are used by dentists.
8:- A convex mirror is a converging mirror.
9:- A virtual image is always erect.
10:- Spherical mirrors obey the same laws of reflection of light as plane mirrors.

C:- Name the following
1:- Bending of light when it moves from one optical medium to another.
2:- Splitting of light into seven colours.
3:- The scientist who showed that light is composed of seven colours.
4:- The refractive index of diamond.
5:- A triangular, transparent refracting medium.


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Answer 1

Answer:

b) Speed

c) <I < <r

c) Between F and P

b) Erect and diminished

c) Telescope

B:-

1) True

2) True

3) False

4) True

5) True

6) True

7) False

8) False

9) True

10) True

C:- 1) Refraction

2) Dispersion

3) Isaac Newton

4) 2.417

5) Glass Prism