Question

4. Write two differences between a convex and a concave lens. (2 marks)

5. Explain the phenomenon that you are noticing in the below picture. (2 marks)

6. The distance between two stations is 400 km. A train takes 8 hours to cover this distance. Calculate the speed

of the train. (2 marks)​

Answer 1

4.A convex lens or converging lens focuses the light rays to a specific point whereas a concave lens or diverging lens diverges the light rays. When these lenses are combined, they produce sharper images. ...

Answer 2

Answer:

4. Convex lens

1. Convex lens can form both real and virtual images.

2. It can form magnified image.

Concave lens

1. Concave lens always form a virtual image.

2. Image is always diminished in size.

6. total distance = 400 km

time = 8 hours

speed= distance / time

= 400 km / 8 hours

= 50 km/hr

speed of the train is 50km/hr