Rearrange the boxes given below to make a sentence that helps us to understand opaque objects.

3

(a)

In a completely dark room, if you hold up a mirror in front of you. Will you see a reflection of yourself in the mirror?

3

(a)

On a sunny day, does a bird or an aeroplane flying high in the sky cast its shadow on the ground? Under what circumstances, can we see their shadow on the ground?

3

(a)

Three identical towels of red, blue and green colour are hanging on a cloth line in the sun. What would be the colour of shadows of these towels?

3

(a)

State some of the properties of light.

3

(a)

Suggest a situation where we obtain more than one shadow of an object at a time.

3

(a)

You are given a transparent glass sheet. Suggest any two ways to make it translucent without breaking it.

3

(a)

A student covered a torch with red cellophane sheet to obtain red light. Using the red light, she obtains a shadow of an opaque object. She repeats this activity with green and blue light. Will the colour of the light affect the shadow? Explain.

3

(a)

Differentiate between a shadow and an image.

3

(a)

Using a pinhole camera, a student observes the image of two of his friends standing in sunlight wearing yellow and red shirt respectively. What will be the colours of the shirts in the image?

3

(a)

Suggest any two means for the conversion of a transparent glass sheet into a translucent sheet.

3

(a)

In given figure, a flower made of thick coloured paper has been pasted on the transparent glass sheet. What will be the shape and colour of shadow seen on the screen?

3

(a)

Explain the reason of using a silver glass as a mirror.

3

(a)

Differentiate between a luminous and non-luminous objects.

3

(a)

Show an experiment which proves that light always travels in a straight line.

3

(a)