11) If the sun is 37 degrees of the vertical for a clam, for a bird its at a)30
ID: 1470358 • Letter: 1
Question
11) If the sun is 37 degrees of the vertical for a clam, for a bird its at
a)30 degrees b)45 degrees c)53 degrees d) 70 degrees e)89 degrees
12) if ray inside a plastic rod surrounded by air stays inside the rod when its incident angle is greater than 37 degrees, its n value is
1.24 b)1.33 c)1.67 d)1.75 e)1.8
13) how much is an object magnified if its 3cm from a lens with f=6cm?
a) 2^x b)3^x c)4^x d) 5^x e)6^x
14) the focal length of a lens that forms an image 6cm before it of object is 2cm before it is ?
a) -2cm b) -3cm c) -1cm d) 2cm e) 3cm
Explanation / Answer
11)
53
12)
n = 1/SinC = 1/Sin37 = 1.66
13)
do = 3
f = 6
Using lens equation
1/f = 1/do + 1/di
1/6 = 1/3 + 1/di
di = -6 cm
m = magnification = - di/do = - (-6) / 3 = 2
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