The angle of deviation of light of various colours passing through a glass prism decreases in the order of?
A. blue orange and red B. red, blue and orange C. blue, red and orange D. red, orange and blue E. orange, blue and red Correct Answer: Option C – blue, red and orange
Which of the following is used for controlling the amount of light entering the eye?
A. Cornea B. Pupil C. Iris D. Optic nerve E. Ciliary muscle Correct Answer: Option C – IrisWhen an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eyepiece is 2.50m. What is the distance between the lenses?
A. 20.0cm B. 47.5cm C. 50.0cm D. 52.5cm E. 125.0cm. Correct Answer: Option D Explanation Distance between lens = f0 + fe = 52.5cm
The eye defect illustrated in the diagram below can be corrected by a?
A. convex mirror B. concave mirror C. diverging lens D. converging lens E. piano-converging lens Correct Answer: Option C – diverging lens
A real image of an object fomed by a converging lens of focal length 15cm is three times the size of the object. What is the distance of the object from the lens?
A. 30cm B. 25cm C. 20cm D. 15cm E. 10cm Correct Answer: Option C – 20cm Explanation 1/u + 1/3u = 1/15; u = 20cmProducts
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