A steel wire of 2.0m Cross section is held
Straight
but under no tension) by attaching it firmly now decreases to -10°c and if the two tie point remain fixed what will the tension in the wire. linear expansivity is 1.1^-5k^-1 and young moudulus is 2.0 ×10^11​

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?