2. Define the principal focus of lens.
3. What do you meant by total internal reflection.
4. Define ‘one joule'.
5. What is the 'kWh'.
6. In which district ‘Nahargarh Sanctuary is situated"?
7. In which sanctuary Dadgers are found?
8. Who proposed the concept of biodiversity hotspots.
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Sorry I don't know What I do
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