Question

,उस अवतल दर्पण की फोकस दूरी ज्ञात कीजिये जिस
की वक्रता त्रिजीया 32 cm hai​

Answer 1

Explanation:

f=2r

f=64cm..... is the focal length

Answer 2

Explanation:

Newland’s Law of Octaves: According to this ‘when elements are placed in order of increasing atomic masses, the physical and chemical properties of every 8th element are a repetition of the properties of the first element.’