Mrs, Rashmi Singh broke her readings glasses. When she went to shopkeeper to order new spects, he suggested that she should get spectacles with plastic lenses instead of galss lenses. On getting the new spectacles, she found that the new ones were thicker than the earlier ones. She asked this question to the shopkeeper but he could not offer satisfactory explanation for this. At home, Mrs. Singh raised the same question to her daughter Anuja who explained why plastic lenses were thicker.
(a) Write two qualities displayed each by Anuja and her mother .
(b) How do you explain this fact using lens maker's formula ?

Explanation

### Step-by-step Solution:

**(a) Qualities displayed by Anuja and her mother:**

1. **Anuja's Qualities:**
- **Knowledgeable:** Anuja displayed a good understanding of optics and the properties of lenses, which allowed her to explain the difference in thickness between plastic and glass lenses.
- **Cooperative:** She was willing to help her mother understand the scientific reasoning behind the thickness of the new spectacles.

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