Spherical Mirror

Q.

Name the type of mirror used as a shaving mirror.

1. Concave mirror

2. convex mirror

3. Plane mirror

4. None of above

Q.

A spherical mirror with the outer surface as the reflecting surface is called a _____________.

Q.

If the radius of curvature of a mirror is 20 cm, what is the focal length?

1. 20cm

2. 10cm

3. 40cm

4. 5cm

Q. The central point of the lens through which light passes undeviated is known as ___.

1. optical centre
2. principal axis
3. aperture
4. centre of curvature

Q.

What is a spehirical mirror ?

Q.

Read the extract given below and answer the following questions.

There’s a dusty old window around at the side
With three cracked panes of glass,
I often think there’s someone staring at me
Each time that I pass,
I’ll peep through that window one day.

Why does the poet want to peep through the window as he passes it?
(a) To see the ghost
(b) To steal something
(c) To find out if somebody is staring at him
(d) To see his brother and his friends