1) A telescope has a main mirror that magnifies 63 times and an eyepiece lens th

Question

1) A telescope has a main mirror that magnifies 63 times and an eyepiece lens that magnifies 11 times. What is the overall magnification of this telescope?

2) A student measures the index of refraction of a gooey, transparent liquid to be 1.40. How fast does light travel in this liquid?

3) A student measures the index of refraction of a gooey, transparent liquid to be 1.40. How fast does light travel in this liquid?

4) An object is placed 18 cm in front of a lens of focal length 11 cm. Where is the image formed?

5) An object is placed 20 cm in front of a diverging lens of focal length -9 cm. Where is the image formed?

6) An ray of light is incident on a block of transparent material with an angle of incidence of 36. The angle of refraction is 25 degrees. What is the index of refraction? Use Snell's Law and remember that the index of refraction of air may be taken to be 1.00.

7) An ray of light is incident on a block of transparent material with an angle of incidence of 40. The angle of refraction is 33 degrees. What is the index of refraction? Use Snell's Law and remember that the index of refraction of air may be taken to be 1.00.

8) The largest and most powerful telescopes

A. are reflecting telescopes.

B. have magnifications of 50-60 times.

C. use red light instead of white light.

D. use diffraction to make the image sharper.

E. are refracting telescopes.

Explanation / Answer

1) M = m1*m2 = 63*11 = 693

2) v = c/u = (3*1e8)/1.4 = 2.14*10^8 m/s

3) v = c/u = (3*1e8)/1.4 = 2.14*10^8 m/s

4) 1/s+1/s' = /1f

s' = sf/(s-f) = (18*11)/(18-11) 28.28 cm

5) s' = -20*9/(20+9) = -6.2 cm

6) n1*sini = n2*sinr

1*sin36 = n2*sin25

n2 = 1.39

7) n1*sini = n2*sinr

1*sin40 = n2*sin33

n2 = 1.18

8) A. are reflecting telescopes.

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