The real image of an object formed by a converging lens of focal length 15cm, is three times the size of the object. Calculate the object distance?
A. 60cm B. 30cm C. 20cm D. 15cm Correct Answer: Option C – 20cm
The refractive index of glass for yellow light is greater than that for red light because yellow light?
A. has a greater amplitude than red light B. is more intense than red light C. travels more slowly than red light D. deviates less than red light Correct Answer: Option C – travels more slowly than red light
The image of an object is located 6cm behind a convex mirror. If its magnification is 0.6; calculate the focal length of the mirror
A. 3.75cm B. 6.60cm C. 10.00cm D. 15.00cm Correct Answer: Option D – 15.00cm
The air column in a resonance tube is set into resonance by a vibrating tuning fork. The resultant waves in the air column will be?
A. mechanical and transverse B. progressive and longitudinal C. stationary and transverse D. stationary and longitudinal. Correct Answer: Option D – stationary and longitudinal.
A ray of light is incident on a plane mirror at an angle of 20°. This mirror is rotated through, twice this angle, In this new position the angle between the incident ray and the reflected ray is
A. 20° B. 40° C. 80° D. 120° Correct Answer: Option B – 40°Products
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