Class 7 Chapter 15 Light
A. VERY SHORT ANSWER TYPE QUESTIONS
1. What do you understand by the rectilinear propagation of light?
2. Name the phenomenon that enables us to see the objects around us.
3. What is a real image ?
4. Where is the image formed in a plane mirror ?
5. What is the order of colours in a rainbow ?
Answers
Answer:
class 8 I am
Explanation:
- class 8 I am like me
Answer:
1. Rectilinear propagation describes the tendency of electromagnetic waves (light) to travel in a straight line. Light does not deviate when travelling through a homogeneous medium, which has the same refractive index throughout; otherwise, light suffers refraction.
2. the phenomenon that enables us to see things around us is called persistence of vision.
3. A real image is the collection of focus points actually made by converging rays, while a virtual image is the collection of focus points made by extensions of diverging rays. ... A real image occurs where rays converge, whereas a virtual image occurs where rays only appear to diverge.
4. A plane mirror makes an image of objects in front of the mirror; these images appear to be behind the plane in which the mirror lies. A straight line drawn from part of an object to the corresponding part of its image makes a right angle with, and is bisected by, the surface of the plane mirror.
5.The colours of the rainbow are Red, Orange, Yellow, Green, Blue, Indigo and Violet.