Question

a compound is prepared from gypsum upon heating to a temparature of 373k and it changes back to gypsum on adding water which is the incorrect statment about the compound a)the compound is used for fractured bones b)the compound is called plaster of paris which is calcium sulphate dy hydrate with a formula caso4.2ho c)if heated at higer temparature the compound becomes dehydrated and is called dead burnt plaster d) both 1and 2​

Answer 1

Answer:

answer (b)

Explanation:

when plaster of paris is heated then at 100 celcius then gypsum is formed

Answer 2

Lens formula

Explanation:

The lens maker formula gives the relationship between focal length, radius of curvature and the refractive index of the lens.

Mathematically it is given as :

Where,

F is the focal length

n is the refractive index

are the radius of curvature of the lens

In case of converging lens :

is positive

is negative

F is positive

In case of diverging lens :

is negative

is positive

F is negative.

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