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2711

The speed of light in a certain medium is V while its speed in a vacuum is C. The absolute refractive index of the medium is

A. C + V
B. \(\frac{C}{V}\)
C. \(\frac{V}{C}\)
D. C - V

View Answer & Discuss (2) WAEC 2011

2712

An object is placed 20.0cm in front of a converging lens of focal length 15.0cm. Calculate its image distance

A. 1.3cm
B. 8.6cm
C. 35.0cm
D. 60.0cm

View Answer & Discuss (4) WAEC 2011

2713

Presbyopia is a defect of the eye resulting from

A. weak ciliary muscles
B. short eyeball
C. loss of sphericity of the lens
D. long eyeball

View Answer & Discuss (1) WAEC 2011

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2714

The focal length of the eye-piece of an astronomical telescope is f₁, while the focal length of the object is f₂. Fro normal adjustment, the angular magnification is given by

A. \(\frac{f_2}{f_1}\)
B. 1 - \(\frac{f_2}{f_1}\)
C. \(\frac{f_2}{f_1}\) - 1
D. \(\frac{f_1}{f_2}\)

View Answer & Discuss (4) WAEC 2011

2715

two sound waves have frequencies of 12Hz and 10Hz. Calculate their beats period

A. 0.5s
B. 1.0s
C. 1.2s
D. 2.0s

View Answer & Discuss (3) WAEC 2011

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