Question

010. You have 3 opaque strips with very small holes of different shapes as shown in the
Figure given below. If you obtain an image of the Sun on a wall through these roles, wil
the image formed by these holes be the same or different?​

Answer 1

Answer:

Explanation:

Aug 11, 2017 - Solution: (c) The table top must be made of glass sheet because only a glass sheet can show the images of both the students, which can be seen by both of them. Question 8: You have 3 opaque strips with very small holes of different shapes as shown in figure.

Answer 2

Answer:

T

he world is largely known through

the senses. The sense of sight

is one of the most important

senses. Through it we see mountains,

rivers, trees, plants, chairs, people and

so many other things around us. We also

see clouds, rainbows and birds flying

in the sky. At night we see the moon

and the stars. You are able to see the

words and sentences printed on this

page. How is seeing made possible?

16.1 What makes Things

Visible

Have you ever thought how we see

various objects? You may say that eyes

see the objects. But, can you see an

object in the dark? It means that eyes

alone cannot see any object. It is only

when light from an object enters our

eyes that we see the object. The light

may have been emitted by the object, or

may have been reflected by it.

You learnt in Class VII that a polished

or a shiny surface can act as a mirror. A

mirror changes the direction of light

that falls on it. Can you tell in which

direction the light falling on a surface

will be reflected? Let us find out.

16.2 Laws of Reflection

Activity 16.1

Fix a white sheet of paper on a

drawing board or a table. Take a

comb and close all its openings

except one in the middle. You can

use a strip of black paper for

this purpose. Hold the comb

perpendicular to the sheet of paper.

Throw light from a torch through

the opening of the comb from one

side (Fig. 16.1). With slight

adjustment of the torch and the

comb you will see a ray of light along

the paper on the other side of the

comb. Keep the comb and the torch

steady. Place a strip of plane mirror

in the path of the light ray (Fig.

16.1). What do you observe?

After striking the mirror, the ray of

light is reflected in another direction.

The light ray, which strikes any surface,

is called the incident ray. The ray that

comes back from the surface after

reflection is known as the reflected ray

Explanation: