Question

fill in the blanks
1) the salts of a strong and weak base are ___ with pH value _____ than 7.
2) acids turn ____ litmus solution ____
3) _____ mirror is used as a security mirror is n shops and in roads at sharp bends and concealed entrances
4) the focal length of a lens is the distance between ____ and_____ of the lens
5) in order to calculate the power of a lens we need its focal length in ____​

Answer 1

Answer:

Explanation:

1. slightly acidic, less than

2. red

3. Convex

4. focus, optical centre

5. metres