26. The Goggles! They Do Nothing! What 0.5 m to see an object clearly that is 20

Question

26. The Goggles! They Do Nothing! What 0.5 m to see an object clearly that is 20 away from the eye? power eyeglasses are needed to allow a far sighted person whose near point is are held 1cm (a) 3.00D (b) 7.00D (c) 7.22D (d) 3.22D 27. Working for The Man on a fancy federal energy commission. A proposal for a nuclear You are a bureaucrat power plant is brought to you. The engineers of the bidding company (also known as lobbyists) claim that they can extract 1.4 GW from the nuclear reactors, which operate at 6500 C, and send 1.05 GW to the grid as useful energy. The plant will be built on an environmentally sensitive portion of a river, and they claim that the water used to help cool the plant will be sent downstream at a temperature of only 320 C. Is this plant consistent with the laws of physics? Pick the answer that best describes the situation. (a) Yes, the plant is plausible. Its efficiency is 75% (b) No, the plant is implausible. Its efficiency is 75% (c) No, the plant is implausible. Its eficiency is 67% (d) Yes, the plant is plausible. Its efficiency is 67%

Explanation / Answer

solving First question of the page

Q 26

Solution

near point =v=-50 cm

distance between glass and eye=1 cm

object distance=u=20-1=19 cm

using

1/u +1/v =1/f

we got f=30.64 cm

power=100/30.64=3.2 D

option (d) is correct

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