Question

answer of 1, 2 and 6

Answer 1

1) Every Crystal seems to be dry but it contain some amount of water in itself.
e.g.
* FeSO4.7H20
* CuSO4.5H2O
*Na2CO3.10H2O

2) given absolute refrective index is 2
then
2 = c/v
thus
2 = 3.0*10^8/v
v=3*10^8/2
velocity of light in medium will be 1.5*10^8 m/s

6) b) the power of eye by which it can show far and near objects by changing focal length is called power of accommodation

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Answer 2

3. ohm's law is
V=IR
2. n= c/v, where n is the refractive index
c is the speed of light in vaccum and
v is the speed of light in transparent medium.