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Optics
Q6. A converging lens images the sun at a distance of 20 cm from the lens. What is the focal length of the lens?
Optics
a narrow beam of monocromatic lit is incident normally on a diffraction grating third order diffracted beam are formed at an angle of 45 to the original direction.what is the highest order of diffracted beam produced by this grating?
Optics
Describe the image of a candle positioned 20cm in front of a concave mirror of focal length 30cm
A. virtual, inverted, 12cm behind mirror and magnified 3 times
B. real, inverted, 12cm in front of mirror and diminished 3 times
C. virtual, erect, 60cm behind mirror and magnified 3 time
D. real, erect, 60cm in front of mirror and diminished 3 times
A. virtual, inverted, 12cm behind mirror and magnified 3 times
B. real, inverted, 12cm in front of mirror and diminished 3 times
C. virtual, erect, 60cm behind mirror and magnified 3 time
D. real, erect, 60cm in front of mirror and diminished 3 times
Optics
Calculate the refractive index of a triangular prism using parameters: (20, 30, 40, 50, 60 for Angle of Deviation), and (20, 30, 40, 50, 60, 70, 80, 90 for Angle of Incidence). Note that A is 50 degrees.
A. 1.53
B. 1.63
C. 1.73
D. 1.83
A. 1.53
B. 1.63
C. 1.73
D. 1.83
Optics
An estimate of the refractive index of glass is 1.5. If the angle of incidence is 30 degrees the angle of refraction is
A. 19 degrees
B. 60 degrees
C. 35 degrees
D. 70 degrees
A. 19 degrees
B. 60 degrees
C. 35 degrees
D. 70 degrees
Optics
The critical angle for total internal reflection at an air - water interface is approximately 48 degrees. In which of the following situations will total internal reflection occur.
A. light incident in water at 40 degrees
B. light incident in water at 55 degrees
C. light incident in air at 40 degrees
D. light incident in air at 55 degrees
A. light incident in water at 40 degrees
B. light incident in water at 55 degrees
C. light incident in air at 40 degrees
D. light incident in air at 55 degrees
Optics
Find the position and magnification, m, of the image formed by a concave mirror of focal length 24 cm when an object is placed 40 cm from the mirror given that m is V/U
A. 50cm and 2.4
B. 60cm and 2.4
C. 50cm and 1.5
D. 60cm and 1.5
A. 50cm and 2.4
B. 60cm and 2.4
C. 50cm and 1.5
D. 60cm and 1.5
Optics
Why is multiple reflection best observed in department store?
Optics
A ray of light travels from air to glass. The incident ray makes an angle of 45 degrees while the refracted ray makes and angle of 30 degrees with the normal to the interface. The speed of light in air is 3.0×108m/s. What is the of speed of light in glass?
A. 2.12×108m/s
B. 4.24×108m/s
C. 3.73×108/s
D. 3.00×108$/s
A. 2.12×108m/s
B. 4.24×108m/s
C. 3.73×108/s
D. 3.00×108$/s
Optics
Beyond the critical angle, a ray of light moving from dense to rare medium suffers _________
a. diffraction
b. polarization
c. total internal reflection
d. total internal refraction
a. diffraction
b. polarization
c. total internal reflection
d. total internal refraction
