Question

the answers are in blue! please show all of your work! thanks !!

Question 5 Imagine you are 1.4 m below the surface of a pool of water looking up toward the surface. How far in front of you would you need to look before you can no longer see through the surface of the water, i.e. the surface starts to appear mirror-like? Assume there is air above the surface. Answer: x (1.60) * (m) a Question 6 How far from a converging lens with a focal length of 25 cm should an object be to produce a real image that is 2.5 times the size of the object? Answer: X (35.0) x (cm)

Answer 1

t .. applying shell's low we get Sin Oe x 1.33 = Ein gox1. Oe = sin 33) = 48.75° -1 1:33 x = fan 48.75° 1.4 :R=1.4 x tan 98.75° x = 1.596 ~ 1.6 m. 1.6 m in front of me I can see. 8-6 f=+25 en - 2.5 >/३ I u V 2.su . -ve, $t te 145 = 1 Lsut u= (1 s +1)x25 2.5u u = 35 en. the object should be placed 35 am from the object.