An object is placed in front of two plane mirrors inclined at 60º to each other. Determine the number of the images formed?
A. 2 B. 3 C. 5 D. 7 Correct Answer: Option C C. 5an observer hears an echo 1.26 seconds after blowing a whistle near a cliff. calculate the distance of the observer from the cliff. [speed of sound in air = 330ms-1]
A. 104.4m B. 207.9m C. 415.8m D. 523.8m Correct Answer: Option B B. 207.9m Explanation S = vt/2 =330×1.26/2 = 207.9A fish inside a pond appears to be at a depth of 1.5m when viewed vertically from above. The refractive index of the water in the pound is 1.3. Calculate the apparent displacement of the fish?
A. 2.50m B. 1.95m C. 1.50m D. 0.45m Correct Answer: Option D D. 0.45m Explanation Real depth = n x apparent depth = 1.3 x 1.5 = 1.95m Apparent displacement = 1.95 – 1.5 = 0.45mThe diagram below illustrates an electromagnetic wave travelling with speed of 3.0 x 10^8 ms‾¹. Calculate the wavelength of the wave.
A. 0.05m B. 0.15m C. 0.16m D. 0.40m Correct Answer: Option C C. 0.16mThe functional difference between a lens and a mirror is that a lens?
A. reflects a beam of light while a mirror refracts it B. refracts a beam of light while a mirror reflects it C. absorbs incident rays while a mirror transmit them D. transmits incidents ray while a mirror absorbs them Correct Answer: Option B B. refracts a beam of...Products
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