Question

lens is used to focus the sun*s rays in order to heat water in power stations.

Name the lens
and draw the ray diagram showing the image formation for the above.

Also show the path of the
refracted ray in a Biconvex lens when the incident ray passes through

a)optic centre and
b)Focus.

Answer 1

Answer:

ഡൽഹി രണ് നല്ല ലജ്ജ സജ്ജം ഹജ്ജ് ഉംറ ശ്രേഷ്ഠതയും എന്ന ഓക്ക് യ എന്ന ഹജ്ജ് എസ് വൈ എസ് കാസർഗോഡ് ജില്ല ജില്ല ജില്ല

Answer 2

Explanation:

Question : Prove that√5 is irrational.

Answer :

Let us assume that √5 is a rational number.

Sp it t can be expressed in the form p/q where p,q are co-prime integers and q≠0

⇒√5=p/q

On squaring both the sides we get,

⇒5=p²/q²

⇒5q²=p² —————–(i)

p²/5= q²

So 5 divides p

p is a multiple of 5

⇒p=5m

⇒p²=25m² ————-(ii)

From equations (i) and (ii), we get,

5q²=25m²

⇒q²=5m²

⇒q² is a multiple of 5

⇒q is a multiple of 5

Hence, p,q have a common factor 5. This contradicts our assumption that they are co-primes. Therefore, p/q is not a rational number

√5 is an irrational number

Hence proved