A converging lens of focal length 5cm forms a virtual image which is 10cm from the lens. How far from the lens is the object?
A. 2.0cm B. 3.3cm C. 5.0cm D. 10.0cm E. 15.0cm Correct Answer: Option B – 3.3cm Explanation f = uv/(u+v) 5 = −10u/(−10+u) 50+5u = −10u 50 = −10u−5u u = 50/−15 u=...
The refractive index of a medium relative to air is 1.8. Calculate the critical angle for the medium to the nearest degree.
A. 18° B. 34° C. 45° D. 68° E. 90° Correct Answer: Option B – 34°
When a ray of light is incident normally on an air- glass interface, its angle of refraction is?
A. 0° B. 42° C. 45° D. 60° E. 90° Correct Answer: Option A – 0°
The inside of a vacuum flask is usually coated with silver to reduce heat lost by?
A. convection B. conduction C. radiation D. absorption E. evaporation Correct Answer: Option C – radiationProducts
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