Question
s the angle of incidence is increased for a ray incident on a reflecting surface, the angle between the inciden 21. A D. 45° t and the reflected rays ultimately approaches what value? C. 90 A. zero B. 180 22. A fish is 1.2 m benea th the surface of a still pond of water (n-1.33). Approximately at what angle to the vertical should the fish look toward the surface in order to see a A. 48 fisherman sitting on a distant bank C. 42° D. 37 B. 19 ard the surtapond of Use the following information for the next 2 (wo) questions A scientist investigate the refraction of light as it enters and exits a semi-circular piece glass as shown in the dhagram below. She ensures that the light entering the glass always enters along the normal to the surface between the air and the glass. Light Glass 02 23. Why does the light seem to bend away from the normal as it exits the glass? Because the frequency is decreasing as it exits the glass Because the wavelength is getting shorter as it exits the glass Because the light is slowing down as it exits the glass Because the light is speeding up as it exits the glass Because the frequency is increasing as it exits the glass A. B. C. D. E. 24. When the scientist repeats her experiment with a different color of light, she notices that the angles changes slightly. This is because of A. Polarization D. Diffraction E. Dispersion B. Total internal reflection C. Interference 25. How do the frequency and wavelength of light change when light passes from air to glass? A. Both wavelength and frequency remain the same B. Both wavelength and frequency decrease C. Wavelength decreases and frequency increases D. Wavelength increases and frequency dcreases E. Wavelength decreases and frequency remains constant
Explanation / Answer
1) ans B
The angle of incidence is the angle between the incident ray and the normal. As this angle approaches 90 degrees, the reflected ray also approaches a 90 degree angle with the normal; thus, the angle between the incident and reflected ray approaches 180 degrees.
