A beam of monochromatic light goes from material 1 with index of refraction n_1

Question

A beam of monochromatic light goes from material 1 with index of refraction n_1 into material 2 with index of refraction n_2. The frequency of light 2 is f_2. What is the ratio of f_1/f_2? a. n_1/n_2 b. n_2/n_1 c. 1 d. n_1 n_2 e. The values of n1 and n2 must be known to find the answer The critical angle for a substance in air is measured at 53.7 degree. If light enters this substance from air at 45.0 degree with the normal, at what angle with the normal will it continue to travel? a. 26.7 degree b. 34.7 degree c. 45.0 degree d. 53.7 degree e. It will not continue, but will be totally reflected. A concave mirror has radius R. When an object is located a distance 2R from the lens, which describes the image formed? a. real, inverted, diminished b. real, inverted, enlarged c. virtual, upright, diminished d. real, inverted, of equal size e. virtual, inverted, enlarged A person's near point is 25 cm, and her eye lens is 2.7 cm away from the retina. What must be the focal length of this lens for an object at the near point of the eye to focus on the retina? a. -3.4 cm b. -2.4 cm c. 2.4 cm d. 3.4 cm e. 2.6 cm An individual's eye pupil changes from a diameter of 3.5 mm to 1.5 nun as the illumination is increased. By what factor does the minimum angle of resolution change? a. 0.43 b. 0.65 c. 2.0 d. 2.3 e. 5.25

Explanation / Answer

Q1.

the ratio f1/f2 =1 because frequecy of light does not change from one medium to other.

Q2.

As

refactive index=1/sine of critical angle

n=1/sin(53.7)=1.24

according to snell's law.

sini/sinr=n

sinr=sini/n=sin(45)/1.24

so r=34.77 degree

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