Answer: Option A. ->
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Infinite number of images will be formed in this case an image formed on one mirror will produce another image on the second mirror and so it will go on.

Answer: Option A. ->
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Non-luminous: 1 Mark
Examples: 1 Mark
The objects, which do not emit their own light, are known as non-luminous objects. We can see a non-luminous object only if they reflect light coming from a luminous object. Moon and earth are the examples of a non-luminous object.

Answer: Option A. ->
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Circular Shadow: 1.5 Marks
Rectangular Shadow: 1.5 Marks
A cylindrical object can cast shadows in two ways. When the top circular view faces the sun, a circular shape is formed. When it's horizontal side faces the sun, it casts a rectangular shadow.
It will look like the following figure.

Answer: Option A. ->
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Luminous object: 1 Mark
Example: 1 Mark
Moon: 1 Mark
The objects, which emit their own light, are known as luminous objects. Example:  Sun.
No, the moon is not a luminous object because it does not emit its own light. The moon appears bright at night because it reflects the sunlight that falls on it.

Answer: Option A. ->
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Each Point: 1 Mark
$\begin{array}{cc}\text{Image}& \text{Shadow}\\ \text{(1) It is formed by reflected rays}& \text{It is formed when no light}\text{is allowed to pass through the object}\\ \text{(2) Images can be seen when reflected}\text{light approaches observer’s eye}& \text{No light approaches observer’s eye}\\ \text{(3) Image provides a lot of information}\text{like colour, shape, etc.}& \text{Shadows are vague and}\text{don’t provide any information}\\ \text{(4) Image can be straight or inverted}& \text{Shadow is not inverted}\\ \text{(5) Size is same as that of the object}& \text{Size can be smaller or larger}\end{array}$

Answer: Option A. ->
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Reflection of light: 1 Mark
Activity: 4 Marks
When light rays hit a highly polished smooth surface like a mirror, it bounces back to the same medium like a ball thrown against a wall. It is called the reflection of light.
Activity to show the reflection of light: Ask 3 of your friends to join this activity. In a dark room or in the night, ask one of your friends to hold the mirror in one corner of the room. You and your other friend stand anywhere in the room. Take a torch and direct beam of light to the mirror that your friend is holding. Adjust the direction of the torch so that some of the beam of light hits on your friend. This activity shows that the light you directed hits the mirror and bounces back to your friend.

A mirror reflecting beam of light

Answer: Option A. ->
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If 2 Points: 3 Marks
If 3 Points: 5 Marks
(a) The shadow of the pencil will be small in size when the pencil is taken away from the candle and closer to the wall.
(b)The shadow will be big in size when the pencil is taken away from the wall and closer to the candle.
(c)To get the same sized shadow as the pencil, move the pencil to bring it at an equal distance between the wall and the candle.

Answer: Option A. ->
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Light travels in a straight line. This principle is behind the working of a pinhole camera.

Answer: Option A. ->
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Answer: 1 Mark
Reason: 2 Marks
No, you won't be able to see your reflection in the mirror.
An image is formed when light is reflected by an object and reaches our eye. In the dark room, there is no light, which means there won't be any reflection of light. Hence, no image will be formed by a mirror in a completely dark room.

Answer: Option A. ->
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Reason: 3 Marks
Shadows are formed when an object is placed in the path of light and that object does not let the light pass through it. Shadows are formed on the opposite side of the object.
During morning and evening, the incident angle of the light is very small. Due to this, long shadows are formed in the morning and evening than the noon.