A.State True or False.
1.You can see shadows in the dark.
2.The body which emits light of its own is called transparent body.
3.Pinhole camera is based on the principle that light travels in straight line.
4.Mirror is a smooth highly polished reflecting surface.
5.Light travels in curved line.
B.Fill in the blanks.
1.The_______ and________ of an object differ in many ways.
2.Pinhole camera cannot be used for studying ____________ objects.
3.The________ of an object gives an idea about it.
4.The substance which does not allow light to pass through it is called ________ object.
5.Light emitting body is called ___________ .
C.Answer the following.
1.Name a luminous and a non-luminous body.
2.Name the types of substances on the basis of their behaviour towards light.
3.Name the ray of light that returns after falling on a mirror.
4.Name a device based on the principle that light travels in straight line.
D.Correct the following sentences.
1.The moon is a luminous body.
2.The CFL bulb is a natural source of light.
3.When an opaque object is placed in the path of a beam of light an image is formed.
4.A solar eclipse occurs when the Sun, the Moon and the Earth come in a straight line.
5.The image formed by a pinhole camera is always erect and magnified.
E.Choose the correct words from the brackets.
1.Objects that reflect light are called (luminous/non-luminous) objects.
2.A clean glass of dirty water is (transparent/translucent).
3.Light travels in (curved/straight) lines.
4.Shadows are (longer/shorter) at noon.
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