Answer Happy

Show work in all below problems. (2) A Telescope at Yerkes observatory has an objective lens of focal length 10 m and an eyepiece of focal length 28 mm. With the naked eye, the star Strius subtends an angle of 0.3 ac-seconds. Calculate the angle subtended in the eyeplace of the Yerkes telescope, In arc-seconds. (2) ) In the below system of two lenses separated by 25 cm, the first lens has a focal length of +10 cm while the second lens has a focal length of -10 cm. (Therefore the first lens is converging while second lens is diverging). The object is located 20 cm to the left of the first lens. Calculate the following concerning the final Image: (a) is the final image real or virtual? (b) is the final image erect or Inverted? (c) calculate the final image distance 92 d) calculate the overall lateral magnification of the system 20cm f = +10m 25 cm - f = -10 cm A light ray of wavelength 400 nm in water (n = 1.33) travels from water into air. If the angle of incidence is 45°, (a) calculate the angle of refraction in air (3) (6) calculate tre wavelength of this light ray in air (c= 3x108 nls) . 2 air water 4) (4) An antireflection coating is made of a material with an index of refraction 1.44 and this coating is applied to a glass lens of index of refraction 1.55. Calculate the minimimum two thicknesses of this coating such that we will get destructive interference in the reflected light. Assume the light has a wavelength of 500 nm in air.