7.3 Reflection and images

Question 1

What is reflection? Name its two types.

Answer 1

Reflection is the phenomena where light incident on a surface bounces back into the medium it was travelling it. Based on the nature of the surface, reflection can be of two types.

Question 2

What does incident mean?

Answer 2

Incident means when light shines on an object.

When light is incident on a surface, reflection, absorption and transmission will always take place.

Question 3

What is irregular reflection?

Answer 3

Irregular reflection, also known as diffused reflection occurs when light is incident on a rough surface. This does not produce an image and as the surface is rough, it is not geometrically accurate. Irregular reflection illuminates non-luminous bodies.

Question 4

What is regular reflection?

Answer 4

Regular reflection takes place when light is incident on a smooth surface. This produces an image and as the surface is smooth, the image it geometrically accurate.

Question 5

What are the properties of an image formed in a plane mirror?

Answer 5

Properties of image in a plane mirror -
1. Image is formed behind the mirror
2. Object distance is equal to image distance
3. The image is upright in nature and is a virtual image
4. The image in the mirror is laterally inverted.

Question 6

What are virtual images? What are real images?

Answer 6

Virtual images are images that u need to look through an object to see. Real images are images which you do not need to look through an object to see.

Question 7

What does laterally inverted mean?

Answer 7

The phenomena of laterally inverted is lateral inversion. During this phenomena, when you put up your left hand, it appears to be the opposite.