Question

Both Ram and Shyam are holding a lens in their hand. They try to read a newspaper column through their respective lenses. The text appears magnified and erect to Ram, but it appears diminished and erect to Shyam.

(n) State the types of lens held by Ram and Shyam. (b) Which lens can also show the text inverted and magnified ?

(c) Suggest the arrangement of the lens and the newspaper in order to obtain the type of image given in part (b).

(d) In which lens, the nature of the image remains the same irrespective of the relative position of the lens and newspaper ? (e) State one application of each kind of lens.​

Answer 1

Answer:

Explanation:

question 25: Write balanced chemical equations to explain what happens, when

(a) Mercuric oxide is heated

Answer: Mercury oxide decomposes to mercury and oxygen when heated. This reaction is utilized during extraction of mercury.

2HgO → 2Hg + O2

(b) Mixture of cuprous oxide and cuprous sulphide is heated