1. A vertically polarized beam of light of intensity 100 W/m2 passes through a p

Question

1. A vertically polarized beam of light of intensity 100 W/m2 passes through a polarizer with its polarizing axis at 60 degrees with the vertical. What is the intensity of the transmitted light? (a) 50 W/m2 (b) 25 W/m2 (c) 12.5 W/m2 .

2. The focal length of a converging thin lens is f = 5.0 cm. If an object is placed 10 cm in front of the lens , then the real image will have what distance di behind the lens? (a) di = 5.0 cm (b) di = -10 cm (c) di = 10 cm (d) none of the above

3. What is the critical angle of incidence for a light ray traveling from water to air? (a) 41.25 degrees (b) 48.75 degrees (c) 90 degrees (d) none of the above

4. What is the critical angle of incidence for a light ray traveling from glass (n = 1.53) to water (n = 1.33)? (a) 41.25 degrees (b) 48.75 degrees (c) 90 degrees (d) none of the above

5. Is there a critical angle for light traveling from water to glass? (a) yes (b) no

Explanation / Answer

1. I = I0 (cos@)^2

I = 100 ( cos60)^2 = 25 W/m^2

2. 1/f= 1/di + 1/do

1/5 = 1/di + 1/10

di = 10 cm

3. ni sin = nr sin90

1.33 siniC = 1 * sin90

iC = 48.75 deg

4. 1.53 sinIc = 1.33 sin90

iC = 60.4

Ans(d)

5. No

critical angle is only when ray travels from denser medium to lighter medium.

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