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Classification of Objects

Fill in the b...

Question

Fill in the blanks using the correct word given in the bracket:
1. Light is a form of ............................ . (energy/electricity)
2. All bodies which emit light energy by themselves are called ............................ bodies. (luminous/opaque)
3. Light travels in a ............................ line. (straight/curved)
4. A glowing electric bulb is an example of ............................ source of light. (natural/artificial)
5. Any polished surface from which regular reflection takes place is called a ............................ . (mirror/obstacle)
6. Reflection from a mirror gives clear ............................ . (image/shadow)
7. The shadow of a coloured object is ............................ . (coloured/black)
8. The image formed by a mirror is due to ............................ of light. (reflection/ propagation)

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Solution

1. Light is a form of energy. (energy/electricity)
2. All bodies which emit light energy by themselves are called luminous bodies. (luminous/opaque)
3. Light travels in a straight line. (straight/curved)
4. A glowing electric bulb is an example of artificial source of light. (natural/artificial)
5. Any polished surface from which regular reflection takes place is called a mirror. (mirror/obstacle)
6. Reflection from a mirror gives clear image. (image/shadow)
7. The shadow of a coloured object is black. (coloured/black)
8. The image formed by a mirror is due to reflection of light. (reflection/ propagation)

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Q. Fill in the blanks with the correct words.

1. We get diffused reflection from a .................... (rough/smooth) surface.
2. A smooth polished surface that can return the rays of light incident on it to form a clear image is called a .................... (lens/mirror).
3. Convex and concave mirrors can both form .................... (real/virtual) images.
4. A lens is made of a .................... (translucent/transparent) material.
5. .................... (White/Blue) light consists of many colours.

Q. Fill in the blanks:
1. The phenomenon of turning back of light into the same medium on striking a polished surface is called ........................ of light.
2. A ........................ image is always inverted.
3. In a spherical mirror, if the reflecting surface is on the outside, it is called a ........................ mirror.
4. ........................ lens is thicker in the middle and thinner at the edges.

Q. Identify the correct one/ones from the following statements.
1. Image is a true reflection of an object.
2. Image formed by a plane mirror can be seen on a screen.
3. Image is formed by light rays.
4. Image provides the details of the shape and colour of the object.

Q. Image formation by a mirror is due the phenomenon of reflection of light.

Q. Statement I : Rays incident on a convex mirror from a point source of light, after reflection diverge.
Statement II : A convex mirror can never form a real image for a point source of light.

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