Question

Q1. Two different types of lenses are placed on a sheet of newspaper. How will you identify them without touching?

Q2. We need a shiny surface for reflection. Explain why.

Q3. The concave reflecting surface of a torch got rusted. What effect would this have on the beam of light from the torch?

Q4. State the correct sequence (1-7) of colours in the spectrum formed by the prisms A and B shown in the figure.

Q5. Briefly explain why in ambulance words are written laterally inverted. 

Q6. It was observed that when the distance between an object and a lens decreases, the size of the image increases. What is the nature of this lens? If you keep on decreasing the distance between the object and the lens, will you still able to obtain the image on the screen? Explain

Q7. Consider if one half of a convex lens is covered with a black paper, then state whether this lens produces a complete image of the object.

Q8. Explain why concave mirror is known as a converging mirror.​

Answer 1

Explanation:

1.If the letters appear bigger/magnified, then the lens is a convex lens. If the letters appear smaller, then the lens will be concave lens.